Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 10
A block is at rest on a rough surface. Which force prevents it from sliding?
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.
Which of the following is an example of rolling friction?
(1) A book sliding on a table
(2) A car tire moving on a road
(3) A person walking
(4) A block at rest
Which of the following is NOT a type of friction?
(1) Static friction
(2) Kinetic friction
(3) Rolling friction
(4) Magnetic friction
Which of the following is NOT a way to reduce friction?
(1) Polishing surfaces
(2) Using ball bearings
(3) Increasing surface area
(4) Applying oil
Which of the following is NOT an effect of friction?
(1) Production of heat
(2) Wear and tear
(3) Increase in speed
(4) Generation of sound
Friction always acts _______ to the direction of motion.
Friction is a _______ force.
If the normal force between two surfaces is doubled, the frictional force will _______.
The force of friction depends on the nature of the surfaces in contact and the _______ acting between them.
True or False: Friction always acts in the direction of motion.
True or False: Friction can be completely eliminated.
True or False: Friction can produce heat.
True or False: Friction is a non-contact force.
