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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.
Liquids offer more friction than the gases.
Name the two kinds of forces in nature.
List three ways of reducing friction.
Define static friction
Define rolling friction
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
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
