Potential Energy

Q.

A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?

Q.

A vehicle of $50\mathrm{quintal}$ climbs up a hill of $10\mathrm{m}$. The potential energy gained by it is (take $\mathrm{g}=10\mathrm{m}/{\mathrm{s}}^2$).

Q.

A machine that is $75\%$ efficient uses $12J$ of energy in lifting up a $1kg$ mass through a certain distance. The mass is then allowed to fall through that distance. What will its velocity be at the end of its fall?

Q.

What form of energy is possessed by the following:

A bird sitting on top of a tree

Q.

When a person climbs a hill, he possesses

1. only K.E.

2. only P.E.

3. both K.E. and P.E.

4. neither K.E. nor P.E.

Q.

Derive an expression for P.E. of a stone thrown up on the roof of a house.

Q.

An object of mass m when raised to height h possess a potential energy of 1200J. Find the new potential energy: (a)if the same object is raised to height h/4 (b)if the same object is raised to height 4h

Q. justify tht a body at a greater height has larger energy

Q.

A body is dropped from a height h. After it has fallen a height h, it would possess

1. (a) only potential energy

2. (b) only kinetic energy

3. (c) more potential and less kinetic energy

4. (d) more kinetic and less potential energy