Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 12
A 10 kg box rests on a horizontal surface. If the coefficient of static friction is 0.4, what is the maximum static frictional force that can act on the box? (Take g = 9.8 m/s²)
A 15 kg box is pushed with a force of 100 N on a horizontal surface. If the box moves with constant velocity and the coefficient of kinetic friction is 0.68, what is the normal force acting on the box? (Take g = 10 m/s²)
A 2 kg object is placed on a 30° inclined plane. If the coefficient of static friction is 0.5, will the object slide down? (Take g = 10 m/s²)
A 20 kg crate is at rest on a horizontal floor. The coefficient of static friction is 0.5. What is the minimum horizontal force required to just move the crate? (Take g = 9.8 m/s²)
A block of mass 5 kg is pulled on a rough horizontal surface with a force of 30 N. If the coefficient of kinetic friction is 0.2, what is the acceleration of the block? (Take g = 10 m/s²)
A car of mass 1000 kg is moving at a constant speed on a level road. If the coefficient of kinetic friction between the tires and the road is 0.3, what is the frictional force acting on the car? (Take g = 9.8 m/s²)
Describe the effect of increasing the normal force on the frictional force between two surfaces.
Describe two methods to reduce friction between two surfaces.
Explain the difference between static friction and kinetic friction.
Explain why ball bearings are used in machines.
Explain why it is easier to walk on a rough surface than on a smooth, wet floor.
State one advantage and one disadvantage of friction in daily life.
