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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.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
What is the cause of friction?
List three ways of reducing friction.
Tick the most appropriate answer.
Friction produces
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Is there any possibility of making a special device to measure the magnitude of friction directly?
In figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
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.
