Kinetic Friction Video Lessons

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Problem: A wood box is first pushed by a person across a wood floor at a steady speed, and then the person stops pushing; the box then continues to slide for a distance before coming to a stop. Which statement best describes the net force on the box while it is sliding to a stop?Answera. The net force points in the same direction as the box's velocity.b. The net force points down (because of the box's weight).c. The net force is zero.d. The net force points in a direction opposite to the box's velocity.e. The net force points up (because of the normal force from the wood floor onto the box).

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The friction force acts in the direction opposite to the motion of the object. 

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Problem Details

A wood box is first pushed by a person across a wood floor at a steady speed, and then the person stops pushing; the box then continues to slide for a distance before coming to a stop. Which statement best describes the net force on the box while it is sliding to a stop?
Answer
a. The net force points in the same direction as the box's velocity.
b. The net force points down (because of the box's weight).
c. The net force is zero.
d. The net force points in a direction opposite to the box's velocity.
e. The net force points up (because of the normal force from the wood floor onto the box).

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