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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
Name the two kinds of forces in nature.
State two factors which directly affect the force of friction.
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in detail.
Write the characteristics of the force of friction?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
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.
