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Question
Answer the following in short.
What do you understand by normal force?
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Solution
A force exerted by a surface to support the weight of a body in contact with it is called the normal force. It is always perpendicular (right angles) to the surface. For example, when a book is kept on a table, the table exerts a normal force which acts upward on the book to support its weight.
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RELATED QUESTIONS
Friction opposes the ______ between the surfaces in contact with each other.
Select the correct alternative.
Friction is reduced by
Arrange the following in descending order:
- static friction
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- rolling friction?
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What do you understand by a force?
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Rolling friction offers ............. resistance than sliding friction.
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Bicycles use ...................... to reduce friction between the pedals and the crank
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
