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प्रश्न
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
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उत्तर
It is because when the object is at rest, static friction occurs. The static friction is maximum when the applied force is just short of the force required to start motion between the two bodies in contact. Once the object starts moving, friction (resistance) we feel decreases.
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संबंधित प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
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.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Answer the following in short.
Define force. Write its SI unit.
Tick the most appropriate answer.
Friction for an object can be reduced by
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
State if the following statement is true or false. Correct the statement if it is false.
Friction is offered by all the three states of matter.
Answer the following in a word or two or in a sentence.
Name the force responsible for opposing the motion between two bodies in contact.
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.
