33. A 45N boy rides a skateboard down the sidewalk with a constant velocity. He applies a steady force of 8 N to maintain his speed. Draw a free body diagram to illustrate all forces acting on the boy. A) What is the frictional force he experiences? B) What is his acceleration? C) What is the normal force?

See answers below

Explanation:

A) The frictional force is 8 N in the opposite direction of the applied force (8 N).

B) The acceleration is zero because the boy is skateboarding at a constant velocity.

C) The normal force is 45 N in the opposite direction of the gravitational force (45 N).

For the free body diagram, draw a boy/dot with an upward arrow of 45 N, a downward arrow of 45 N, a right arrow of 8 N, and a left arrow of 8 N.

where are the vectors ?

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement