Friction on Inclined Planes

1. Explain in your own words how the normal force is determined when an object is on an inclined plane and an additional force is applied to the object at an angle.

2. A block of wood is resting on an inclined plane. The angle of inclination is 30°. The coefficient of static friction between the block and the plane is 0.4. Calculate the force of static friction acting on the block if its mass is 2 kg.

3. A box with a weight of 50 N is being pulled up a ramp at a constant speed. The ramp is inclined at an angle of 20° to the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.3. What is the magnitude of the force of friction acting on the box?