Question

The work done by all the forces (external and internal) on a system equals the change in

• A. total energy
• B. kinetic energy
• C. potential energy
• D. none of these

Answer 1

The correct option is B

kinetic energy

1. According to the definition, the work-energy theorem states the net work done by the forces on an object equals the change in its kinetic energy.
2. The work done by external forces may lead to an increase in the total energy, but the work done by internal forces can only vibrate the atoms or molecules leading to the movement of particles.
3. The work done by all the forces (external and internal) on a system equals the change in kinetic energy.

Hence, the correct option is b