Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 11
A block is sliding down an inclined plane with a constant velocity. What can you say about the net force acting on the block?
Describe one advantage and one disadvantage of friction in daily life.
Explain why ball bearings are used in machines.
Explain why it is difficult to walk on a smooth, icy surface.
A 10 kg box rests on a horizontal surface. If the coefficient of static friction is 0.4, what is the maximum static friction force that can act on the box? (Take g = 9.8 m/s²)
A 2 kg object is placed on a rough horizontal surface. If the coefficient of static friction is 0.5, what is the maximum horizontal force that can be applied before the object starts to move? (Take g = 10 m/s²)
A 20 kg crate is at rest on a horizontal floor. The coefficient of static friction is 0.3. What is the minimum force required to just start moving the crate? (Take g = 9.8 m/s²)
A 50 kg box is pulled with a force of 200 N on a horizontal surface. If the coefficient of kinetic friction is 0.3, what is the acceleration of the box? (Take g = 10 m/s²)
Which of the following best defines friction? (1) The force that opposes the relative motion between two surfaces in contact (2) The force that attracts objects towards the Earth (3) The force that acts at a distance between two objects (4) The force that accelerates an object in motion
Which of the following factors does NOT affect the force of friction between two surfaces? (1) Nature of surfaces (2) Area of contact (3) Normal force (4) Type of friction
Which of the following is a correct unit for the coefficient of friction? (1) Newton (2) Kilogram (3) No unit (4) Meter per second
Which of the following is NOT a method to reduce friction? (1) Lubrication (2) Making surfaces rougher (3) Polishing surfaces (4) Using ball bearings
Friction always acts in the direction _______ to the direction of motion or intended motion.
Friction converts mechanical energy into _______.
Frictional force is a _______ force, meaning it acts only when two surfaces are in contact.
The force of friction is directly proportional to the _______ force between the two surfaces in contact.
True or False: Friction can be both beneficial and harmful depending on the situation.
True or False: Friction is a non-conservative force.
True or False: The coefficient of static friction is always greater than the coefficient of kinetic friction for the same pair of surfaces.
True or False: The frictional force depends on the relative speed between the surfaces for kinetic friction.
