Question

Is change in potential energy is equal to change in kinetic energy?
When is change in potential energy equals work done and when does change in kinetic equals work done?

Plzz someone help out. I am really confused

Answer 1

total energy to a system is sum of kinetic energy and the potential energy.. loss in potential energy is gain by kinetic energy of system.. if we ignore all other kind of energy like heat loss friction loss sound loss... a system gains a potential energy when we work opposite to that a natural force or a field like for a example if we lift a body from the ground to a height h meter.. than we do a work against the natural force of gravity.. and this displacement from the ground to height against gravity force stores as the potential energy in body....and in case of kinetic energy the energy stored by the body is difference of change in kinetic energy at initial to that kinetic energy at final point.. because if system gain or loose the energy there will be change in velocity.. this change in velocity produce change in kinetic energy.... hope it will help you..