A force acts on a body but does negative work. This means the force
Correct answer: B. has a component opposite to the displacement, so it removes energy from the body
- A. acts in the same direction as the displacement
- B. has a component opposite to the displacement, so it removes energy from the body
- C. does no work at all
- D. acts at right angles to the displacement
Explanation
Friction and air resistance always oppose the motion and therefore always do negative work, reducing the kinetic energy. A force at right angles does zero work rather than negative work, which is the distinction being tested. Gravity does negative work on a body moving upwards and positive work as it comes back down.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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