मराठी

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

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प्रश्न


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

पर्याय

  • from right to left (←) 

  • from left to right (→)

  • vertically downwards (↓)

  • vertically upwards (↑) 

MCQ
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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
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 12: Friction - Multiple Choice Questions [पृष्ठ ६८]

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

संबंधित प्रश्‍न

Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.


Write true or false.

The sliding friction is more than the rolling friction.


Fill in the blank.

We use ball bearings to .................. the friction.


What is the cause of friction?


When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.


List three ways of reducing friction.


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


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.

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.


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

Like charges always attract each other.


Answer the following in short.

What do you understand by normal force?


Tick the most appropriate answer.

Force of friction comes into play when a/an


Rolling friction is slightly greater than sliding friction.


Complete the analogy.

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


Why is a ball bearing used in a cycle hub?


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


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.


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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