Question

A ball is at rest at the top of a hill. It rolls down the hill. At the bottom of the hill the ball hits a wall and stops.
Which energy changes occur?

• A. Gravitational potential energy $\to$ internal energy $\to$ kinetic energy
• B. Gravitational potential energy $\to$ kinetic energy $\to$ internal energy
• C. Kinetic energy $\to$ gravitational potential energy $\to$ internal energy
• D. Kinetic energy $\to$ internal energy $\to$ gravitational potential energy

Answer 1

Answer: (B)

Gravitational potential energy $\to$ kinetic energy $\to$ internal energy

When the ball is present at the top of hill

Due to its height from the ground it has gravitational potential energy stored in it.

When it rolls down the hill due to its motin the potential energy gets converted into kinetic energy.

When the ball suddenly stops , the kinetic energy gets converted into internal energy due to its collision with the wall