Friction
Physics ⇒ Mechanics
Friction starts at 8 and continues till grade 12.
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See sample questions for grade 9
A block is pushed across a table and comes to a stop. What force is responsible for stopping the block?
A box is at rest on a horizontal surface. Which type of friction prevents it from moving when a small force is applied?
A car skids more on a wet road than on a dry road. Explain why.
Describe how friction helps in lighting a matchstick.
A 10 kg box is resting on a horizontal surface. If the coefficient of static friction is 0.5, what is the maximum static frictional force? (Take g = 10 m/s²)
A 2 kg book is lying on a table. If the coefficient of friction between the book and the table is 0.3, what is the frictional force? (Take g = 10 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 pushed across a table and comes to a stop. What force is responsible for stopping the block?
Which of the following is an example of useful friction?
(1) Brakes in a bicycle
(2) Wear and tear of shoes
(3) Heating of machine parts
(4) Erosion of rocks
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 increase friction?
(1) Making surfaces rougher
(2) Using oil
(3) Adding treads to tires
(4) Increasing the weight of the object
Which of the following is NOT affected by friction?
(1) Speed of a moving object
(2) Direction of motion
(3) Mass of the object
(4) Wear and tear
Fill in the blank: Friction between layers of a fluid is called _______ friction.
Fill in the blank: The frictional force that acts when a body is at rest is called _______ friction.
Fill in the blank: The frictional force that acts when an object is moving is called _______ friction.
Fill in the blank: The frictional force that acts when an object rolls over a surface is called _______ friction.
True or False: Friction always acts in the direction of motion.
True or False: Friction can act when an object is not moving.
True or False: Friction can be completely eliminated.
True or False: Friction can produce heat.
