CBSE Class 8 Science Friction Assignment Set C

CBSE Class 8 Science - Friction (3)

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FRICTION

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1.When does a body start motion?

2.What is the cause of friction?

3.What is rolling friction?

4.What is sliding friction?

5.What do you mean by the term drag?

6.What is the direction of frictional force?

7.Find the odd one out with reason; Gravitational force, magnetic force, electrostatic force and

frictional force.

8.What is force of friction?

9.Explain, how the frictional force is used to stop a moving bicycle?

10.What is the most common way to reduce friction?

(A) Lubrication. (B) Warning signs. (C) Eliminate the motion. (D) None.

11.Do you want to increase or decrease friction when riding a bicycle?

(A) Increase. (B) Both. (C) Decrease. (D) None.

12.Why is it harder to start to slide a heavy box across the floor than to keep it sliding?

(A) Static friction is greater than kinetic friction.

(B) Kinetic friction is greater than the static friction.

(C) Sliding friction is less than rolling friction.

(D) None.

13.What is an advantage of using rollers instead of sliding an object?

(A) Rollers are much less expensive

(B) Rolling friction is much less than sliding friction

(C) Rolling friction has the advantage of being greater than sliding friction.

(D) None

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