Friction on Inclined Planes

1. Define the term "coefficient of friction" and explain what it represents in the context of an object on an inclined plane.

2. A box is placed on an inclined plane. Draw a free body diagram showing all the forces acting on the box, including the force of gravity, the normal force, and the force of friction. Label each force clearly.

3. A 10 kg block rests on an inclined plane angled at 25° to the horizontal. If the coefficient of static friction between the block and the plane is 0.4, calculate the force of friction acting on the block. Assume the block is not moving.