Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Friction depends on the ______ of surfaces.
Give examples to show that friction is both a friend and a foe.
Select the correct alternative.
Friction is reduced by
List three ways of reducing friction.
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 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?
Answer the following in detail.
What are the various effects of force? State one example of each.
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 has no relation with our walking or running.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
Answer the following in short.
List the various states of matter that offer frictional force?
A moving body comes to rest due to friction alone.
Rolling friction is slightly greater than sliding friction.
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Why is a ball bearing used in a cycle hub?
Explain how friction can be minimized.
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.
