The work-energy theorem states that the net work done on a body equals
Correct answer: B. the change in its kinetic energy
- A. its total mechanical energy
- B. the change in its kinetic energy
- C. the change in its potential energy
- D. its momentum
Explanation
The work-energy theorem equates net work with the change in kinetic energy, which is why a braking force doing negative work brings a car to rest. It holds whether the force is constant or varying. Changes in potential energy relate to the work done by conservative forces specifically, which is a narrower statement.
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About Work-Energy Theorem
The work-energy theorem states that the net work done on an object equals its change in kinetic energy. Questions involve positive and negative work, variable forces and force-displacement graphs, acceleration or deceleration, and the difference between this theorem and conservation of mechanical energy, which also requires attention to potential energy and non-conservative work.
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