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In’figure, a boy is shows pushing the box from right to left. The force of friction will act on the box - Science

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प्रश्न

In figure, a boy is shown pushing the box from right to left. The force of friction will act on the box

विकल्प

  • from right to left (←) 

  • from left to right (→)

  • vertically downwards (↓)

  • vertically upwards (↑) 

MCQ

उत्तर

from left to right (→)

Explanation - 

The force of friction will be from left to right (→) because the friction force always acts in opposite direction to the motion.

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

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एनसीईआरटी एक्झांप्लर Science [English] Class 8
अध्याय 12 Friction
Multiple Choice Questions | Q 2. | पृष्ठ ६८

संबंधित प्रश्न

Friction opposes the ______ between the surfaces in contact with each other.


A charged glass rod attracts a charged plastic straw.


Write true or false.

The sliding friction is more than the rolling friction.


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 sliding 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.


Fill in the blank.

More the roughness of a surface, greater is the ........................


Fill in the blank.

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


Tick the most appropriate answer.

Friction for an object can be reduced by


Tick the most appropriate answer.

Friction produces


Fill in the blank.

Bicycles use ...................... to reduce friction between the pedals and the crank


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 a word or two or in a sentence.

Name the force responsible for opposing the motion between two bodies in contact.


Explain how friction can be minimized.


Friction depends on the ______ of two surfaces in contact.


Analogy

Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.


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.


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