Practice Problems on Frictional Force
1. A 1000 kg car is parked on a flat road. If the coefficient of static friction between the tires and the road is 0.75, what is the maximum force that can be applied horizontally to the car before it starts to move?
2. A 50 kg box is sliding on a horizontal surface with a coefficient of kinetic friction of 0.2. If a horizontal force of 100 N is applied to the box, what will be its acceleration?
3. A 200 g book is initially resting on a wooden table with a coefficient of static friction of 0.4. If the table is gradually tilted, at what angle (in degrees) will the book start to slide?
4. A 500 N block is placed on an inclined plane with an angle of 30 degrees. The coefficient of kinetic friction between the block and the plane is 0.3. Calculate the net force acting on the block parallel to the inclined plane if it is moving at a constant velocity.
5. A 10 kg block is hanging from a rope over a pulley. The coefficient of kinetic friction between the block and the surface is 0.2. If the block is released from rest, what will be its acceleration?
What is Frictional Force?
Frictional Force or Force of Friction is the opposing force when two surfaces come in contact with each other to move either in the same direction or in opposite directions. As friction is a force that opposes or resists the motion of an object that comes in contact and slides against each other. Hence, the frictional force is a Contact Force. Friction is a force that always opposes motion. The frictional forces are majorly affected by the texture of the surface of the objects that came in contact with each other and the amount of force exerted on them.
Table of Content
- What is Frictional Force?
- Frictional Force Formula
- Calculation of Frictional Force
- Factors Affecting Frictional Force
- Types of Frictional Forces
- Dry Friction
- Fluid Friction
- Frictional Force Examples