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प्रश्न
Explain why sportsmen use shoes with spikes.
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उत्तर
Sportsmen wear shoes with spikes because they give them a better grip while running. The force of friction between the shoes and the ground increases with the help of spikes.
संबंधित प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
Friction depends on the ______ of surfaces.
List three ways of reducing friction.
Define sliding friction
Define rolling friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Answer the following in short.
Define force. Write its SI unit.
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 ........................
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Tick the most appropriate answer.
Friction is offered by
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
State if the following statement is true or false. Correct the statement if it is false.
Friction has no relation with our walking or running.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
List the various states of matter that offer frictional force?
Explain how friction can be minimized.
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: 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.
