Work

What is the correct formula for work (W)?

• W = Fd

• W = Fd cosθ

• W = Fd sinθ

• W = F/d

A person holds a heavy dictionary stationary with their arm extended. Is the person doing work on the dictionary according to the physics definition?

• Yes, because a force is being applied.

• No, because there is no displacement of the dictionary.

• Yes, because the person feels tired.

• No, because the force is not strong enough.

When an object is lifted upwards, what type of work is done by the applied force?

• Negative work

• Zero work

• Positive work

• No work is done

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A person walks horizontally while holding a book at a constant height. What is the work done by the person's applied force on the book?

• Positive work

• Negative work

• Zero work

• Work cannot be determined without knowing the distance.