Advertisements
Advertisements
प्रश्न
Answer the following in detail.
Define friction and explain how it is useful to us.
उत्तर
Friction is a force that opposes relative motion between two bodies/surfaces in contact with each other. Although friction opposes the motion, it also makes motion possible.
Friction helps us do many things like :
- It helps us in walking. In the absence of friction, we may slip or M.
- Cars and buses are able to move safely on roads due to the friction between the treaded tires of these vehicles and the surface of the road.
- Friction allows us to hold objects with our hands.
- It allows us to write on paper.
- Friction produces heat. In winter, when we rub our cold hands, the heat produced due to friction makes our hands warm.
APPEARS IN
संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
Write true or false.
Liquids offer more friction than the gases.
Fill in the blank.
We use ball bearings to .................. the friction.
State two factors which directly affect the force of friction.
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
Friction produces
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
A moving body comes to rest due to friction alone.
Friction depends on the ______ of two surfaces in contact.
Assertion: There is a danger of a vehicle skidding on a wet road.
Reason: The tires of the vehicle lose their grip on the road due to an increase in friction due to the presence of water on the road.
