Friction on Inclines

1. Define the term "coefficient of friction" and explain its role in determining the force of friction.

2. Explain why the normal force on an object on an inclined plane is not equal to the object's weight (mg). Instead, what force is the normal force equal to?

3. A block with a mass of 2 kg is resting on an inclined plane angled at 30° to the horizontal. If the coefficient of static friction between the block and the plane is 0.4, calculate the force of static friction acting on the block.