Along the surface of the hill, toward the top of the hill
Along the surface of the hill, toward the top of the hill.
A P E X :))
The force of friction always acts in the opposite direction of motion or potential motion. Since Billy is standing on a hill without slipping, it means that he is not moving or about to move. Therefore, the force of friction will act in the uphill direction, opposing any potential downhill motion. To determine the direction of the force of friction, you can analyze the situation using Newton's laws of motion. The force of gravity pulls Billy downhill, while the force of friction acts uphill to keep him stationary.
