When a force acts on an object from an angle other than either 0° or 180° to the direction of motion:

1) The force is perpendicular to the direction of motion, so no work gets done.

2) The parallel and perpendicular component of the force both do work.

3) The perpendicular vector component of the force does work but the parallel one does not.

4) The parallel vector component of the force does work but the perpendicular one does not.

5) The force is not in the direction of motion, so no work gets done.

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  1. The answer is #4. I had that same question and got it right.

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