मराठी

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play - Science

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प्रश्न

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

पर्याय

  • only if the objects are solid.

  • only if one of the two objects is liquid.

  • only if one of the two objects is gaseous.

  • irrespective of whether the objects are solid, liquid or gaseous.

MCQ

उत्तर

irrespective of whether the objects are solid, liquid or gaseous.

Explanation - 

Force of friction acts in solids, liquids and gases and opposes the motion with respect to each other.

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Force of Friction
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पाठ 12: Friction - Multiple Choice Questions [पृष्ठ ६८]

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एनसीईआरटी एक्झांप्लर Science [English] Class 8
पाठ 12 Friction
Multiple Choice Questions | Q 1. | पृष्ठ ६८

संबंधित प्रश्‍न

Friction depends on the ______ of surfaces.


Explain why sportsmen use shoes with spikes.


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


Name the two kinds of forces in nature.


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


Give three examples to illustrate that friction is a necessary evil.


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

  1. the static friction
  2. sliding friction and
  3. rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

Fill in the blank.

.................... is the SI unit of force.


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 a word or two or in a sentence.

Which type of force acts on a string pulled from both ends?


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

Why does a rolling ball stop after moving some distance?


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.


Tick the most appropriate answer.

Friction produces


Fill in the blank.

Friction is a type of .................


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.


Friction depends on the ______ of two surfaces in contact.


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.


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