Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 8
A 10 kg box is pushed with a force of 40 N and moves at constant speed. What is the frictional force acting on the box? (Take g = 10 m/s²)
A 5 kg object is pulled with a force of 25 N and moves at a constant velocity. What is the frictional force acting on the object?
A ball is rolling on a level ground and eventually comes to a stop. Which force is responsible for stopping the ball?
A block is sliding down an inclined plane. Name the two forces acting on the block.
A box weighing 50 N is at rest on a horizontal floor. If the maximum static friction is 20 N, what is the minimum force required to move the box?
A car skids on a wet road. Explain why this happens in terms of friction.
Describe one situation where friction is undesirable.
Explain why ball bearings are used in machines.
Explain why brakes in vehicles use friction to stop the vehicle.
Explain why it is difficult to walk on ice.
Explain why the soles of shoes are made rough.
List two advantages and two disadvantages of friction.
Name two ways to reduce friction between two surfaces.
What happens to friction if the normal force between two surfaces increases?
What is friction?
What is meant by lubrication?
What is the force of friction that acts on an object when it is not moving called?
What is the main cause of friction between two surfaces?
What is the SI unit of frictional force?
A 3 kg object is placed on a horizontal surface. If the coefficient of kinetic friction is 0.2, calculate the frictional force acting on the object when it is moving. (Take g = 10 m/s²)
