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Why do weightlifters apply chalk powder on their palms while lifting weights?

Important Questions on Friction

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8th CBSE
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 7
Consider the following diagram which shows a box being pulled by force:
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Which one of the following actions will decrease the frictional force on the box?
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 8
In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 9
Alida runs her toy car on a 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 _____.
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 10

Rajesh was walking along the footpath. He stepped on a banana skin and slipped.

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Rajesh slipped because

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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 11
Which of the following has the least magnitude?
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 12
Mohan was helping his father move a heavy wooden TV cabinet by sliding it along the floor. His father, instead, pushed one edge of an old blanket under the cabinet. He then pulled the blanket, thus dragging the cabinet along the floor. What property of the frictional force was used to make it easier to push the cabinet?
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 13
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. The correct arrangement is:
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Science Textbook of Competency Based Questions for Class VIII>Chapter 9 - Friction>Exercise>Q 14

A car is accelerating on a road in the direction shown in the figure. The tyre shown is connected to the engine. In which direction is the force of friction exerted by the road on the tyre?

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