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NCERT solutions Science Textbook For Class 8 chapter 12 Friction

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Chapter 12 - Friction

Page 155

Fill in the blanks.

Friction opposes the ________ between the surfaces in contact with each other.

Q 1.1 | Page 155 | view solution

Fill in the blanks.

Friction depends on the _________ of surfaces.

Q 1.2 | Page 155 | view solution

Fill in the blanks.

Friction produces _________.

Q 1.3 | Page 155 | view solution

Fill in the blanks.

Sprinkling of powder on the carrom board ________ friction.

Q 1.4 | Page 155 | view solution

Fill in the blanks.

Sliding friction is ________ than the static friction.

Q 1.5 | Page 155 | view solution

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

(a) rolling, static, sliding

(b) rolling, sliding, static

(c) static, sliding, rolling

(d) sliding, static, rolling

Q 2 | Page 155 | view solution

Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be

(a) wet marble floor, dry marble floor, newspaper and towel.

(b) newspaper, towel, dry marble floor, wet marble floor.

(c) towel, newspaper, dry marble floor, wet marble floor

(d) wet marble floor, dry marble floor, towel, newspaper

Q 3 | Page 155 | view solution

Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.

Q 4 | Page 155 | view solution

You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?

Q 5 | Page 155 | view solution

Explain why sportsmen use shoes with spikes.

Q 6 | Page 155 | view solution

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?

Q 7 | Page 155 | view solution

Explain why sliding friction is less than static friction.

Q 8 | Page 155 | view solution

Give examples to show that friction is both a friend and a foe.

Q 9 | Page 155 | view solution

Explain why objects moving in fluids must have special shapes.

Q 10 | Page 155 | view solution

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