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Extra Questions-Answers For Class 8 Science Chapter 9 Friction Question

Extra Questions-Answers For Class 8 Science Chapter 9 Friction

Question 1:
What is the force of friction?
Answer
The force acting on a moving object equal and opposite to the direction of motion is called force of friction.

Question 2:
What is the cause of friction?
Answer
Friction is caused by the irregularities on the two surfaces in contact.

Question 3:
Name the types of friction.
Answer
(1) Static Friction 
(2) Sliding Friction
(3) Rolling Friction 
(4) Fluid Friction

Question 4:
Give some examples to show that friction produces heat.
Answer
The examples are:
(1) Rubbing of our hands to keep us warm in winter.
(2) Rubbing matchsticks on the rough surface to make fire.

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