A crate full of artichokes rests on a ramp that is inclined 10.0° above the hori

Question

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations.
(a) The crate is at rest.
Normal Force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

Firction force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

(b) The crate is being pushed and is sliding up the ramp.
Normal Force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

Firction force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

(c) The crate is being pushed and is sliding down the ramp.
Normal Force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

Firction force :
perpendicular to and away from the ramp
perpendicular to and into the ramp
along the ramp upward
along the ramp downward

Explanation / Answer

a)the crate is at rest. normal force is perpendicular to and away from the ramp. friction force is perpendicular and into the ramp. b)the crate is moving upwards normal force is perpendicular to and away from the ramp. frictional force is along the ramp in downward. c)the crate is moving downwards normal force is perpendicular to and away from the ramp. frictional force is along the ramp in upward. the normal force is always perpendicular to the contact surface and opposite to weight. frictional force is opposite to the direction of motion.

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