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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
विकल्प
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.
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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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संबंधित प्रश्न
Write true or false.
The sliding friction is more than the rolling friction.
Fill in the blank.
We use ball bearings to .................. the friction.
State two factors which directly affect the force of friction.
Define sliding friction
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction for an object can be reduced by
Tick the most appropriate answer.
Friction produces
Fill in the blank.
Friction is a type of .................
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.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in short.
List the various states of matter that offer frictional force?
Rolling friction is slightly greater than sliding friction.
Why is a ball bearing used in a cycle hub?
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
Friction depends on the ______ of two surfaces in contact.
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
