Putting the value of F in eq(7), we get that, \[W=m(\frac{v^2}{2s}\times S=\frac{1}{2}mv^2)\]. What are some practical applications for Kinetic Energy? the first time in 1738 to obtain the molecular characteristics of gas molecules using the ideal gas law and mechanical energy. For example, engineers need to know how much kinetic energy a moving object will have in order to design things like cars and airplanes that are safe for people to use. For a better experience, please enable JavaScript in your browser before proceeding. 14 thoughts on "Derivation of Kinetic Energy Equation" . Yes Now i . Although I get the impression it is not read as much, I do think it is probably frequented by more people who actually work in industry. Your Mobile number and Email id will not be published. If the resultant force acting on a particle is perpendicular to its velocity, the speed does not change and hence the kinetic energy does not change. View solution > Kinetic energy of a body depends on its . The derivation of kinetic energy is one of the most common questions asked in the examination. The kinetic energy of a body is the energy that is possessed due to its motion. You can target the Engineering ToolBox by using AdWords Managed Placements. So maybe the NET force on the blade is less than what you would calculate just considering the momentum flux on the incident side. Also show how the units on each side of the equation are equal for the final power equation. How can the hydropower equation be derived from the kinetic energy equation when considering the power produced by a hydropower turbine? What is Kinetic Energy? Energy from Hydro-power The potential theoretical energy in a volume of elevated water can be calculated W = m g h = V g h (3) where W = energy (J) m = mass of water (kg) V = volume of water (m3) Example - Energy in Elevated Water Volume 10 m3 volume of water is elevated 10 m above the turbine. It's also an important component in the calculation of work. What I am more interested in, though, is the power transferred to a turbine. For instance, a flying squirrel could encounter chipmunks that are stationary. Put your understanding of this concept to test by answering a few MCQs. 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For example, if you lift an object with a certain amount of force, that object has gained kinetic energy. Just look at the plot I posted. Here's my current dilemma: I'm attempting to turn the rotor of a generator that has a moment of inertia J=.066 Kg*m^2. Yes, but isn't that the linear velocity, equal to the angular velocity times the radius? Deriving Kinetic Energy Equation Kinetic energy equation can be obtained by the basic process of computing the work (W) that is done by a force (F). The calculator below can be used to calculate available hydroelectricity power. The amount of work done in giving the velocity to the body from the state of rest. of the body = W = \[\frac{1}{2}mv^2\]. This work done on the body is because of the Kinetic energy (K.E) of the body. Theory of Relativity - Discovery, Postulates, Facts, and Examples, Difference and Comparisons Articles in Physics, Our Universe and Earth- Introduction, Solved Questions and FAQs, Travel and Communication - Types, Methods and Solved Questions, Interference of Light - Examples, Types and Conditions, Standing Wave - Formation, Equation, Production and FAQs, Fundamental and Derived Units of Measurement, Transparent, Translucent and Opaque Objects, A baseball thrown by a pitcher has a small mass but a large amount of kinetic energy due to high, Deriving The Kinetic Energy Formula by Algebra, Derivation of Kinetic Energy Formula by Calculus. = 1/2 m v 2 The kinetic energy has units of kilograms-meters squared per second squared if the mass is in kilograms and the velocity is in meters per second. So in short, I'm not really qualified to answer. After the collision, a portion of the initial energy of the squirrel may be transferred to the chipmunk's body or transformed into an alternative type of energy. Lorem ipssiii, , dictum vitamolestie consequat,uootriac,su,oraciniasaciniaiscingce,ceipisaciniasaciniaicexgue v, congue vel laorginia pulvinar tortsiiuscng efstetriec facfec faclfametac,xac,ec fec facfec faclac,tng ela. The faster an object is traveling, the more kinetic energy it has - and if that object collides with something else, that energy can be converted into other forms (such as heat or sound). Formula. Kinetic energy is the energy that an object receives from its movement. Here, initial velocity u = 0. Nam lacinia pulvinar tortor nec facilisis. Q1: Calculate the average frictional force needed to stop a car weighing 600 kg at a distance of 35 m, if the initial speed is 36 km/h. When mass is constant, KE= (1/2)m*v^2. 1. Pellentesque dap, lestie consequat, ultrices ac magna. Once the work is completed the energy is transmitted to the subject which means that the item will then be moving at a constant speed. JavaScript is disabled. On using equation of motion v 2 = u 2 + 2 a s. Or v 2 = 2 a s. Or a = v 2 2 s. Reply. Nam, cing elit. =\[\frac{1}{2}m(v^2-u^2)\], F x 35 = \[\frac{1}{2}600\times (0-10^2)\]. The more distance the object travels as it's being lifted, the more kinetic energy it will have. 3: The relativistic expression of kinetic energy is valid in all inertial reference frames. If the body's velocity is zero, then the kinetic energy will also be zero. ", consectetur adipiscing elit.oe vel laoreet ac, dictum vitae odio. The fundamental formula for calculating kinetic energy is as follows: \(K.E. Kinetic energy can be converted into different forms of energy such as potential energy, sound energy, heat energy, etc. Considering power output in 1 unit time. The equation I have for available power is: P = 0.5*m*A*v^3 with m=mass, A=area swept by blades, v=horizontal (into the turbine) velocity of the river This is the total power available, correct? 13. 1. Fusosuolestieoitur laoreeoa. Quantitatively the energy of the moving particle is defined by: \[k(\vec{v})=\frac{1}{2}m\vec{v}.\vec{v}\]. the economic viability of a hydro-kinetic energy converter. Once you've moved the object to its final destination, you then must use another type of energy (potential energy) to keep it there. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! But could I logically say that the power AVAILABLE to the turbine would be the total area swept by the turbine blades (picture wind turbine blades rotating) or would it only be the physical area of the blades looking into the rotor? Thus, according to this principle, work and energy are equivalent to each other. Kinetic energy is the energy of motion. Donec aliquet. I was thinking of a "water wheel" type scenario in which one blade enters the water, is pushed along by it, and then leaves just as another is entering, so that our expression for the instantaneous power might actually hold when averaged over longer timescales. The energy of kinetics can transfer between different objects and later be transformed into different forms of energy. February 22, 2016 at 10:51 AM . 8 To express the kinetic energy in units of pound-feet, the units used by the ANSI A156.27 national standard for automatic revolving doors, mass M must be expressed in "equivalent" pounds and the width L of an individual door panel must be expressed in feet. The energy possessed by the body by virtue of its position is known as potential energy. I know that some Pelton wheel turbines can achieve near 100% efficiency, although that is through a conventional dam system, and not an "in-river" turbine like I am talking about. It can also be harnessed to do work. The classical definition to the Kinetic Energy equation is KE=integral of F*dx where F=d (m*v)/dt. Fusce dui lect, "You are a very kind soul. Therefore, the sum of the kinetic energy of a system of particles is the sum of all its constituent particles. The kinetic energy equation is given as: K E = 1 2 m v 2 Where KE is the kinetic energy, m is the body's mass, and v is the body's velocity. You are using an out of date browser. I'm still trying to figure out if Betz' limit for efficiency of wind turbines applies to hydro turbines as well. Thus, according to this principle, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Power = rho x area x mean velocity^3 x Constant, 2022 Physics Forums, All Rights Reserved, http://web.mit.edu/16.unified/www/SPRING/propulsion/notes/node91.html, http://www.google.com/url?sa=t&sourc78ZHxmM8f6j8InQ&sig2=xStxSEYre8keaZal0EnCoQ", Principles similar to aero, hydro dynamics, Deriving the equation of uniform linear motion through differential equations, Calculus and Kinematic equations--- seeing the logic, Fluid mechanics - Linearized shallow water equations. What is Hydropower? Fusce dui lectus, congue ve, susnec facilisis. Here we will learn the derivation of the work-energy theorem and its application. Hydropower currently accounts for 31.5% of total U.S. renewable electricity generation and about 6.3% of total U.S. electricity generation. moving things have energy we call this the kinetic energy but the question is how much kinetic energy does a moving thing have for example if we knew the mass of this ball let's say it was 2 kilogram and let's say it was coming in and coming in at 10 meters per second how much kinetic energy does it have and what would that number mean that is . In physics, a moving particle is said to have more energy than the particle at rest. In order to apply force, we need to work. 4) It's a fundamental part of Einstein's famous formula E = mc. = \frac{1}{2}mv^{2}\) If the bodys velocity is zero, then the kinetic energy will also be zero. Cookies are only used in the browser to improve user experience. K. E = 1 2 m v 2. Or am I mistaken? Hydropower, or hydroelectric power, is one of the oldest and largest sources of renewable energy, which uses the natural flow of moving water to generate electricity. 3. Then equation (2) becomes, v = final velocity = 0 (Since the body will stop finally), W = Change in K.E. Medium. Which is given by: The kinetic energy of a particle or a system of particles can increase or decrease or remain constant as time passes. What are the criteria to decide which equations will give the motion of a gyro-compass. A question: can the angular velocity of the turbine tip ever exceed the velocity of the river? When the frequency () of the incident radiation is equal to the threshold frequency ( 0) of the metal surface, kinetic energy of the electron is zero. Kinetic energy is the work needed to accelerate an object of a given mass from rest to its stated velocity. The end goal is to rewrite the integral in terms of a velocity differential. On putting u = 0 in eq (8) , we get that: K.E. Substituting u = 0 in eq(5), we get that: This statement states that a work W is done by a body to move from one position to another by a distance s when the force F is applied to a body at rest. Please read AddThis Privacy for more information. It's what allows us to do things like riding a bike or driving a car. January 26, 2017 at 7:19 AM . Multiply and divide R.H.S by m, K. E = 1 2 m v 2 m m. = m 2 v 2 2 m. = ( m v) 2 2 m. We know that. v = The velocity acquired by the body while moving a distance s. We know that according to Newtons law of motion: Substituting the value of a in eq(3) we get: \[\Delta K=m(\frac{v^2-u^2}{2s})\]..(5). To excel in their examinations, students must properly understand the kinetic energy derivation method. 3 Rewrite force in terms of velocity. Test your knowledge on Kinetic energy derivation. The small amount of work done by the force will be: dW = \[\vec{F}\] . The kinetic energy of a moving object is equal to the work required to bring it from rest to that speed, or the work the object can do while being brought to rest: net force displacement = kinetic energy, i.e., Since the kinetic energy increases with the square of the speed, an object doubling its speed has four times as much kinetic energy. (Even though A is a function of t in this scenario) However, any effects due to drag etc would depend on the specific set up. 2) It's frequently used in the study of motion. Pellentesque dapibus effi, iscing elit. The concept for hydro-kinetic energy conversion studied in this thesis comprises a vertical axis turbine coupled to a directly driven permanent magnet generator. A heavier body and a body moving faster possess greater kinetic energy and vice-versa. This equation is known as Einstein's photoelectric equation. In fact, it's hard to have an efficient system unless this constraint is met. If we wish to accelerate an object then we need to apply force. This is the kinetic energy of the particle. On the basis of root mean square velocity (RMS) and momentum of . Try posting your lastest query in the electrical engineering subforum as well. .. Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Physics related queries and study materials, Your Mobile number and Email id will not be published. Deriving the Linear Kinetic Energy Equation - YouTube A tutorial on deriving the linear kinetic energy equation that can be applied to AP Physics and other physics courses. This is going to help me dramatically, thank you! Derivation of the Kinetic energy formula: Let a Moving object of mass m is in the state of the rest and with an external force F and with and acceleration a it moves with the velocity v and it travels the s distance. Some of our calculators and applications let you save application data to your local computer. It may not display this or other websites correctly. Kinetic energy is the energy that is transferred to the object. Nam lacinia pulvinar tortor nec facilisis. Water in the environment often has both gravitational potential energy and kinetic energy, which can generate electricity using a generator. I appreciate your help, my friend. The work that is done on an object is related to the change in its kinetic energy. Pellentesque dapibus efficitur laoreet. The potential energy in the water volume can be calculated as, W = (1000 kg/m3) (10 m3) (9.81 m/s2) (10 m), You can estimate the total energy in a tank or a reservoir where the surface area varies with elevation - as typical in a natural reservoir - by integrating the potential energies for horizontal segments as done in the template. The kinetic energy is maximum when the potential energy is maximum, and this occurs when the velocity is maximum and the mass is at the equilibrium position. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Total work done by the force is increasing the velocity of the body from u to v is: \[W=\int_{u}^{v} mvdv=mv[\frac{(1+1)}{(1+1)}]^{v}_{u}=[\frac{mv^2}{2}]^{v}_{u}\], \[\Rightarrow W=m[\frac{v^2}{2}]_{u}^{v}=\frac{m}{2}(u^2-v^2)\], \[\Rightarrow W=\frac{mv^2}{2}-\frac{mu^2}{2}\]=Final K.E - Initial K.E..(8). Now, we know that the kinetic energy of a body at rest is zero. Only emails and answers are saved in our archive. To derive an expression for kinetic energy using calculus, we will not need to assume anything about the acceleration. The word Kinetic energy came from the French word travail mcanique (mechanical work) or quantit de travail (quantity of work). Copy the document to your Google Drive or download it as a spreadsheet to make your own calculations. See Answer See Answer See Answer done loading. Fusce duixa molestie col, consectetur adipixfacilisis. Course Hero is not sponsored or endorsed by any college or university. So the kinetic energy at rest should be zero. The energy transfer is known as kinetic energy and is dependent on the mass and the speed that is achieved. Kinetic energy can be used to power machines, it's essential in the study of motion, and it plays a role in Einstein's famous equation E = mc. The force does some work on a body, the kinetic energy increases by the same amount. Consider the formula of kinetic energy-. The force does some work on a body, the kinetic energy increases by the same amount. \[\vec{ds}\] = F ds Cos 0 = Fds ( Cos 0 = 1), dW = F ds = m \[\vec{a}\] ds ( \[\vec{F}\] = m \[\vec{a}\] ) ( \[\vec{a}\] is an acceleration produced by the force), \[dW=m(\frac{d\vec{v}}{dt})ds\] (\[\vec{a}=\frac{d\vec{v}}{dt}ds\]. Now we already know that kinetic energy is the energy that it possessed due to its motion. Obviously the turbine won't be 100% efficient, so that will invoke some constant. If something contains more potential or kinetic energy than it does mass, then that extra amount can turn into other types of energies such as heat or light. Required fields are marked *. One such cable wound laboratory generator has been constructed and an experimental setup for deployment in the river October 24, 2015 at 6:23 PM . How much torque, or power, will I need the turbine to produce to spin this effectively? A dancing man is said to be more energetic than a snoring man. A force is necessary to change the kinetic energy of the particle. Now rearranging the differential terms to get the function and the integral into an agreement. This is why it's important for car designers to make sure that their vehicles can withstand crashes. Found an excellent article that cleared a few things up here: http://www.carbontrust.co.uk/technology/technologyaccelerator/ME_guide3.htm. The velocity of the turbine tip can most certainly exceed the river (stream) velocity. When you add up all forms of potential and kinetic energy possessed by a body, you get its total mass (m). 2. lestie consequat, ultrices ac magna. Mini Physics. 1. A tutorial on. This holds true whether we're talking about atoms or entire galaxies! We don't save this data. Please also explain how the units are equal on both sides for the final power equation. Kinetic energy can also be transferred between objects and converted into different types of energy. For example, there are various applications of kinetic energy: A nail is driven into a wooden block on the amount of kinetic energy of the hammer striking the nail. Is the area A the total area swept by the blades (ie pi*r^2) or would it be the area of just the blades themselves? A baseball thrown by a pitcher has a small mass but a large amount of kinetic energy due to high velocity. Are you certain that it applies to water turbines as well? Kinetic energy and momentum of a moving body can be mathematically related as follows-. For example, you can use kinetic energy to power a machine by converting it into electrical energy. Nam lacinia pulvinar tortor nec facilis, inia pulvinar tortor nec facilisis. Google use cookies for serving our ads and handling visitor statistics. So we can say that the kinetic energy is: Stay tuned with BYJUS and learn various other derivations of Physics formulas. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. I am working on a vibration problem at work and having to review my Lagrangian Dynamics books from 30 years ago. Torque = rate of change of angular momentum = m ( rinvin - routvout ) Let; When the speed decreases, the kinetic energy will be transformed into potential energy, thermal energy or other forms of energy. Rotational Kinetic Energy Formula Rotational Kinetic Energy = (moment of inertia) (angular velocity) Here, K = I K = kinetic energy (J = kg.m 2 /s 2) I = moment of inertia (kg.m 2) = angular velocity (radians/s) Rotational kinetic energy formula can be used to determine the rotational kinetic energy of a rotating body. AddThis use cookies for handling links to social media. . a bicycle in motion, running water, a bullet fired from gun, walking and running, etc. Write different types of kinetic energies? Derivation of Kinetic Energy Formula by Calculus The formula for kinetic energy can be obtained by the method of calculus: Suppose m = mass of a body u = Initial velocity of the body F = The force applied to the body in the direction of the motion d s = A small displacement of the body in the direction of motion Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. I don't think it could be the area swept out, because picture a turbine with two thin blades, and then a turbine with five meaty blades - intuitively it just makes sense that the five bladed turbine would produce more power although they both "sweep" the same area. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Starting with the work-energy theorem and Newtons second law of motion we can say that. Question: show how the hydropower equation can be derived from the equation for kinetic energy. The kinetic energy derivation using only algebra is one of the best ways to understand the formula in-depth. Click Start Quiz to begin! The energy possessed by an object by virtue of its position or configuration is called its potential energy. Click hereto get an answer to your question Derive the formula for kinetic energy. How can the hydropower equation be derived from the kinetic energy Access to over 100 million course-specific study resources, 24/7 help from Expert Tutors on 140+ subjects, Full access to over 1 million Textbook Solutions. On this page, we will learn about the following: Derivation of kinetic energy using algebra. Solve Study Textbooks Guides. The kinetic energy formula derivation can be done using algebra and calculus. A hydroelectric dam where hydroelectricity is generated. This is why lifting something heavy can be so tiring - you're not just using muscle power to do the work, you're also expending energy to overcome gravity and keep the object in place. As shown by the derivation above, kinetic energy and work are closely related. a = acceleration produced in the body in the direction of force applied. This article will also discuss questions like work-energy theorem class 11, derive the formula for kinetic energy, derivation of the work-energy theorem, state work-energy theorem, etc. I was under the impression that the 59% limit was in specific relation to wind turbines. The kinetic energy is the measure of the work an object can do by virtue of its motion. p.lokesh varma. TSR is greater than unity for the peak of several designs. The kinetic energy can be obtained by either of the following: The amount of work done in stopping any moving object. Relation Between Momentum and Kinetic Energy. I'm investigating the power available in a free flowing river. I was asking regarding the angular velocity. Use the MSWord Equation Editor to type each equation and show all of the units. Now I'm speculating. Kinetic energy =1/2 mass (velocity) Thus, the kinetic energy of a moving body is equal to half the product of the mass (m) of the body and the square of its speed v. In this article we will discuss the kinetic gas equation derivation, derivation of kinetic gas equation, kinetic molecular gases and more. The energy possessed by an object by virtue of its motion is called as kinetic energy. It is used to calculate kinetic energy when the speed of the object is much lower than light speed (C). Starting with the work-energy theorem and then adding Newtons second law of motion, we can say that, Now, taking the kinematics equation and rearranging it, we get. How to quickly derive the equation for kinetic energy, ke=1/2mv^2, for A Level Physics.Download the revision sheet (and other similar worksheets) for this qu. The work done by a force is a measure of the change in kinetic energy of the body which proves the work-energy principle. The kinetic energy of a body is half the product of the mass of the body and the square of the velocity of the body. Join / Login >> Class 11 >> Physics >> Work, Energy and Power >> Kinetic Energy >> Derive the . Reply. Practically available power can be expressed as, = efficiency (in general in the range 0.75 to 0.95), The potential theoretical energy in a volume of elevated water can be calculated, 10 m3 volume of water is elevated 10 m above the turbine. Are you certain that it applies to water turbines as well? Derive Navier-Stokes Equations with Lagrangian and Hamiltonian Mechanics, is that possible? Donec aliq, ng elit. I imagine there is always some drag, because a blade has to displace water behind it. = 1/2 m v This expression, 1/2 m v, gives the energy in joules or ergs according to the system of units used. [1] Hydropower extracts mechanical energy from water, transforming it into electrical energy to generate electricity. The kinetic energy of an item is exactly related to its mass and the square of its velocity: K.E. E.g. Therefore, we can say that kinetic energy is: The derivation of kinetic energy using calculus is given below. (35 pts) N Ravi Shankar. Pellentesque d, gue vel laoreetx, consectetur adipixinia pulvinar tortor nec fac, iscing elit. Show how the hydropower equation can be derived from the equation for potential energy, when considering the power of the falling water in a hydroelectric plant. 1) It's a key component in the calculation of work. Work is the displacement, and displacement is the kinetic energy. Nam lacinia pulviec facicec facffi, s ante, dapibus a molestie consequat, ultricellents,scingce,cex, ctue vel laoreetsu,oraciniasaciniaiscingce,ceipisaciniasaciniaicex, cing elit.ec facuec facusce dui lfstetriec facfec faclfametac,xac,ec fec facfec faclac,tsus, dictum vitae odio. Both methods are explained below. It is determined by the mass and speed of the object. To excel in their examinations, students must properly understand the kinetic energy derivation method. I did in fact mean density instead of mass, which translates to Kg*m. What is obvious to me is that the area in my equation is the portion of the area of a single blade that is in contact with the water (i.e the part that is being pushed). 2. 2 Rewrite work as an integral. So my question is about all of the authors of these books (and internet searches) make . It is used to calculate the kinetic energy when the speed of the object is a considerable fraction of light speed (C). This is how wind turbines and hydroelectric dams work - they capture the kinetic energy of flowing water or air and turn it into electricity that can be used to power homes and businesses. Peuootriac,su,oraciniasaciniaiscingce,ceipisaciniasaciniaicexgue v, Explore over 16 million step-by-step answers from our library, ia pulvinar tortor nec facilisis. The energy possessed by the body by virtue of its motion is known as kinetic energy. We don't collect information from our users. Although this equation is most often used in reference to nuclear energy, remember that all matter has both mass and kinetic energy - the faster an object moves, the greater its kinetic energy will be. What I am not sure about is how a hydroelectric turbine is set up, exactly. The formula for kinetic energy can be obtained by the method of calculus: \[\vec{F}\] = The force applied to the body in the direction of the motion, \[\vec{ds}\] = A small displacement of the body in the direction of motion. Pellentesque dapibus efficitur laoreet. Derivation Using Calculus Download Article 1 Begin with the Work-Energy Theorem. The theoretically power available from falling water can be expressed as, = density (kg/m3) (~ 1000 kg/m3 for water), Download and print Hydro Power vs. Volume Flow and Head chart, The theoretically power available from a flow of 1 m3/s water with a fall of 100 m can be calculated as, P = (1000 kg/m3) (1 m3/s) (9.81 m/s2) (100 m), Due to energy loss the practically available power will be less than the theoretically power. Potential Energy Stored in a Tank or Reservoir. expression 1/2 m v^2. + Explore . Nam risus ante, da, View answer & additonal benefits from the subscription, Explore recently answered questions from the same subject, Explore documents and answered questions from similar courses. Kinetic energy depends upon the body's velocity and mass. This problem has been solved! The kinetic energy of a body is the energy possessed by the body by virtue of its motion. Let's derive the K.E. These applications will - due to browser restrictions - send data between your browser and our server. In this formula, v occurs in the second power and so the speed has a larger effect, compared to the mass, on the kinetic energy. Wow absolutely excellent reply - thank you. The derivation of kinetic energy is one of the most common questions asked in the examination. Joules (J) are commonly used to quantify kinetic energy; one Joule equals 1 kg m 2 / s 2. Thanks for the help guys. I'm attempting to capture this power with a cross-axis (wind turbine style) turbine. I was under the impression that the 59% limit was in specific relation to wind turbines. P = (2Kinetic energy/qin 2 )x ( rinqin cos in - rout qout cos out ) Step-by-step explanation Kindly follow the attachment for the turbine blade diagram; Assuming mass flow rate = m = Q. Q is Volume flow rate. The derivation of kinetic energy is given below so that students can understand the concept more effectively. 1 ) Applying the equation v = u + 2 ax and remembering that u = 0 v = 0 + 2 ax whence a = v / 2x substituting this value of a in equation ( 1 ), we obtain, work done = m v / 2x x = kinetic energy or kinetic energy ( k.e.) because Force is equal to Work x Energy. Kinetic energy depends upon the bodys velocity and mass. Mention the factors that the kinetic energy of a body depends. 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