Potential Energy and Conservative Energy
Potential Energy and Conservative Energy Physics 2070
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This 3 page Class Notes was uploaded by Daria on Tuesday October 11, 2016. The Class Notes belongs to Physics 2070 at Clemson University taught by Pooja Puneet in Spring 2016. Since its upload, it has received 7 views. For similar materials see General Physics in Physics at Clemson University.
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Date Created: 10/11/16
Potential Energy and Conservation of Energy Conservative and Nonconservative Forces ● Conservative force: The work it does is stored in the form of potential energy that can be used at another time. ○ Gravity is a conservative force ○ Friction is a nonconservative force ● Conservative forces are path independent ● Work done by a nonconservative force is path dependent ● If we pick up a block and put it on a shelf, we have done work on the block. We can get that energy back if the block falls off the shelf; in the meantime, we say the energy is stored as potential energy. ● Springs ○ Conservation of Mechanical Energy ● The initial energy of the system is the same as the final energy of the system. Kinetic Energy and Potential Energy 1 2 ● Kinetic Energy: K = m2 ● Potential Energy: U g mgh ● Spring Potential Energy: U s kx2 2 ○ Kinetic Energy is the energy of motion ○ Potential Energy is the energy of position Examples ● A truck sits at rest at the top of a hill. A small push sends it rolling down a hill. After its height has dropped by 5.0m, is it moving at a good clip? ● How much spring potential energy is stored in a popper? ● A 0.1kg ball sits on a spring gun which is aimed upward. If a spring is compressed 0.05m and has a spring constant of 250 N/m, how high does the ball go? ● A spring is stretched from equilibrium, how far is it stretched to do 25 J of work? ● A skier weighs 500N with skis. They move down the slope a verticle distance of 100m. Find the speed of the skier at the bottom of the slope assuming his initial velocity is 10m/s.