Conservation of Energy


Energy changes form -- from PE to KE and from KE to PE -- but the total amount of energy,

ETot = KE + PE

remains constant,

Because of energy conservation, a pendulum has the same maximum displacement on one side as on the other side. If you pull a heavy pendulum up to your chin and release it, it will swing out on the other side to the same height, and then return right back to your chin!

Mechanical Energy

Free Fall

Back to " ToC, Work and Energy" Page

(C) 2003, Doug Davis; all rights reserved