Friction Important Questions And Answers
In any exam, many questions related to science are asked. Science is a very big subject. Therefore, in this post, we have given some important questions and answers ofClass 8th Science Chapter 12 Friction. These questions and answers are asked in exams every year and these questions are also very important for your general knowledge. Therefore, remember these questions and answers well. If you like these questions and answers, then do share them with others.
Question 1: Why does a ball rolling on the floor stop by itself after some time?
(a) Magnetic force
(b) Electric force
(c) Frictional force
(d) Both electric force and frictional force
Answer: Frictional force
Question 2: Why is it difficult to walk on a wet floor?
(a) The frictional force increases.
(b) The frictional force decreases.
(c) Sometimes the frictional force increases.
(d) Because muscular force is unable to increase.
Answer: The frictional force decreases.
Question 3: The force of friction always acts in the direction
(a) Along the direction of motion.
(b) Opposite to the direction of motion.
(c) In a vertical direction.
(d) None of these.
Answer: Opposite to the direction of motion.
Question 4: You roll a glass marble on a cement floor, marble, water, towel, and ice. Arrange the surfaces in increasing order of the frictional force acting on them.
(a) Cement floor, water, towel, marble, ice
(b) Marble, cement floor, water, ice, towel
(c) Ice, water, marble, towel, cement floor
(d) Water, ice, marble, cement floor, towel
Answer: Water, ice, marble, cement floor, towel
Question 5: Static friction is __________ compared to sliding friction.
(a) More
(b) Less
(c) Equal
(d) Sometimes more, sometimes less
Answer: More
Question 6: Arrange the following types of friction in increasing order.
(a) Rolling friction, sliding friction, static friction
(b) Static friction, sliding friction, rolling friction
(c) Sliding friction, rolling friction, static friction
(d) Rolling friction, static friction, sliding friction
Answer: Rolling friction, sliding friction, static friction
Question 7: Static friction begins to act when we
(a) Try to bring an object to a stop from motion.
(b) Try to move an object from rest.
(c) Do not want to change the position of an object.
(d) None of the above.
Answer: Try to move an object from rest.
Question 8: Sliding friction is
(a) More than static friction
(b) Equal to static friction
(c) Less than static friction
(d) Sometimes more, sometimes less than static friction
Answer: Less than static friction
Question 9: Rolling friction is __________ compared to sliding friction.
(a) More
(b) Equal
(c) Less
(d) Sometimes less, sometimes more
Answer: Less
Question 10: Making a surface rough
(a) Has no effect on friction.
(b) Decreases friction.
(c) Increases friction.
(d) None of the above.
Answer: Increases friction.
Question 1: In which direction does the force of friction act?
Answer: The force of friction acts in the direction opposite to the applied force on the object.
Question 2: Why is it difficult to ride a bicycle with the brakes applied?
Answer: Because rolling friction is greater than sliding friction.
Question 3: Why does a rolling ball stop after some time?
Answer: The frictional force between the ball and the Earth’s surface, which resists motion, stops the ball.
Question 4: What is the meaning of friction?
Answer: Friction is a resistance that reduces the motion of an object.
Question 5: Why are tires made circular?
Answer: Because sliding friction is greater than rolling friction.
Question 6: Is friction adaptable? Is this true?
Answer: Frictional force adapts during the motion of an object such that it is equal and opposite to the applied force.
Question 7: Which surface is smoother, a cement floor or a wet soil floor?
Answer: A wet soil floor.
Question 8: What does a spring balance do?
Answer: A spring balance is a device that measures gravitational force.
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