Question

When you lift a box from the floor and put it on an almirah the potential energy of the box increases but there is no change in its kinetic energy. Is it violation of conservation of energy? Explain.

Answer 1

• When the box is on the floor, it has no K.E., but has some P.E. 
• Its P.E. increases as it is lifted and put on an almirah. 
• In this event, the energy produced by the person converts into K.E. and the total M.E. remains same. 
• Hence it is not the violation of conservation of energy.