Friction on Inclined Planes

1. Define friction in your own words, explaining how it affects an object's motion on a slope.

2. Imagine a block on an inclined plane. List the forces acting on the block, and identify which force opposes its motion down the plane.

3. Explain how the roughness of a surface affects the magnitude of the friction force. Provide a real-world example of how increasing the roughness of a slope can prevent slipping.