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Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain. - Science

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प्रश्न

Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.

स्पष्ट कीजिए

उत्तर

When we take off our sweaters in winter, we hear a crackling sound. This is because removing our sweater acquires charge due to friction between the sweater and our body. As a result, we hear a crackling sound from the sweater.

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Force of Friction
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अध्याय 15: Some Natural Phenomena - Exercises [पृष्ठ १९७]

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एनसीईआरटी Science [English] Class 8
अध्याय 15 Some Natural Phenomena
Exercises | Q 4 | पृष्ठ १९७

संबंधित प्रश्न

Explain why sportsmen use shoes with spikes.


A charged glass rod attracts a charged plastic straw.


State two factors which directly affect the force of friction.


The eraser gets smaller and smaller as you use it more and more. Explain the reason.


Define rolling friction


State if the following statement is true or false. Correct the statement if it is false.

If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.


Answer the following in short.

Define force. Write its SI unit.


Fill in the blank.

Rolling friction offers ............. resistance than sliding friction.


Fill in the blank.

Weight remaining the same, friction is independent of ............. of surface in contact.


Fill in the blank.

Sliding friction and rolling friction are types of .................. friction.


Tick the most appropriate answer.

Friction is offered by


Tick the most appropriate answer.

Friction for an object can be reduced by


Fill in the blank

Rolling friction is ............. than sliding friction.


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.


State if the following statement is true or false. Correct the statement if it is false.

Friction helps us to grip the objects in our hand.


Answer the following in a word or two or in a sentence.

Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?


Answer the following in detail.

Describe three different ways by which friction can be increased to help us in various situations?


Complete the analogy.

Knot in a thread : _____ friction : : Ball bearing : _____ friction


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.


Complete the analogy.

Knot in a thread : ______ friction :: Ball bearing : ______ friction.


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