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प्रश्न
Answer the following in short.
What do you understand by normal force?
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उत्तर
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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संबंधित प्रश्न
Write true or false.
The sliding friction is more than the rolling friction.
Select the correct alternative.
Friction is reduced by
Give three examples to illustrate that friction is a necessary evil.
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
Friction for an object can be reduced by
Fill in the blank.
Rolling friction is ........... than sliding friction.
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
State if the following statement is true or false. Correct the statement if it is false.
Friction helps us to grip the objects in our hand.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
