7. The elevator is now moving vertically at a constant speed. It takes 4 N of ho

Question

7. The elevator is now moving vertically at a constant speed. It takes 4 N of horizontal force to make the box start to slide. What can you say about the direction of elevator’s motion?

It is going up.

It is going down.

Not enough information is

given to determine in which direction the box is moving.

8. Now the elevator is accelerating vertically upward by 3 m/s2. What is the minimum horizontal force on the box required to make the box start to slide?

a. b. c. d. e.

5.22 N 4.6 N 4 N 3.4 N 2.78 N

Explanation / Answer

7.

Not enough information is given to determine in which direction the box is moving.

8.   5.22 N if only surface have friction

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