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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
Friction depends on the ______ of surfaces.
Give an example to illustrate the existence of the force of friction.
List three ways of reducing friction.
Answer the following.
What do you understand by a force?
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank.
Friction is a type of .................
Match the following.
| Column I | Column II | |
| a) | Static friction | viscosity |
| b) | Kinetic friction | least friction |
| c) | Rolling friction | objects are in motion |
| d) | Friction between the liquid layers | objects are sliding |
| e) | Sliding friction | objects are at rest |
