Advertisements
Advertisements
Question
Answer the following in short.
What do you understand by normal force?
Advertisements
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.
APPEARS IN
RELATED QUESTIONS
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
Write true or false.
Liquids offer more friction than the gases.
List three ways of reducing 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.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
A moving body comes to rest due to friction alone.
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
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.
