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Kinetic Energy • We already know that Kinetic energy is energy of motion • What does that mean? • What would energy of motion require? Kinetic Energy • Kinetic energy requires motion • In order to be in motion we must have a velocity and object that is moving • Therefore, the Kinetic energy formula uses both mass and velocity Kinetic Energy • The kinetic energy of a moving object is always equal to the work required to bring it to that speed from rest. • Net Force x Distance = Kinetic Energy Work-Energy Theorem • We know that there is a relationship between work and energy • We can say that work will change kinetic energy • If no change in energy occurs then no work is done • This is also true for potential energy Conservation of Energy • Now that we know what energy is, we need to understand how it behaves, how it transforms. • In order to look at this we need to analyze energy as a transformation from one form to another Conservation of energy • If you launch a marble from a sling shot and hit a fence, we know that the potential energy of the rubber band will equal the kinetic energy of the marble. • If the marble hits a fence it delivers its kinetic energy to the fence post. • The work done on the post should equal the force of impact x the Conservation of Energy • The work done on the fence however does not equal the energy from the marble. • This is because some of the energy is transformed into heat from the impact. • The amount of energy used to heat the fence equals the amount of energy difference between the marble and Entropy Slayer 2000 • Entropy Slayer 2000 Law of conservation of Energy • Energy can not be created or destroyed. It can be transformed from one form into another, but the total amount of energy never changes.