QUESTION
You are lying on your back on the slope of a grassy hill, watching the clouds go by
overhead. Which is the best statement about the force of friction exerted on you by the
ground in this situation?
ANSWER
A force of kinetic friction pointing upward, perpendicular to the
surface of the hill, is applied to you by the ground.
A force of kinetic friction pointing "up the hill", parallel to the surface
of the hill, is applied to you by the ground
A force of static friction pointing upward, perpendicular to the
surface of the hill, is applied to you by the ground.
A force of static friction pointing "up the hill", parallel to the surface
of the hill, is applied to you by the ground.
I DON'T KNOW YET