Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 10
A 10 kg box is at rest on a horizontal surface. If the coefficient of static friction is 0.4, what is the maximum static friction force? (Take g = 9.8 m/s²)
A 5 kg object is pulled with a force of 30 N on a horizontal surface. If the frictional force is 10 N, what is the net force acting on the object?
A block is at rest on a rough surface. Which force prevents it from sliding?
A block is sliding down an inclined plane. The frictional force acting on it is 15 N. If the normal force is 50 N, what is the coefficient of friction?
A car of mass 1000 kg is moving on a road with a coefficient of friction 0.2. What is the maximum frictional force acting on the car? (Take g = 10 m/s²)
A suitcase weighing 50 N is dragged on a floor with a coefficient of kinetic friction 0.2. What is the frictional force?
Describe how friction affects the motion of a moving object.
Describe one way in which friction is useful in sports.
Explain the difference between static friction and kinetic friction.
Explain why ball bearings are used in machines.
Explain why it is difficult to walk on ice.
Explain why lubricants are used in machines.
Friction can be both useful and harmful. Give one example of each.
If the coefficient of friction is 0.5 and the normal force is 100 N, what is the frictional force?
If the coefficient of kinetic friction between a box and the floor is 0.3 and the normal force is 200 N, what is the force of kinetic friction?
Name two methods to increase friction.
State one disadvantage of friction.
What is friction?
Which type of friction is responsible for holding a book at rest on a sloped table?
