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प्रश्न
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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उत्तर
Bicycles use ball bearings to reduce friction between the pedals and the crank.
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संबंधित प्रश्न
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
Select the correct alternative.
Friction is reduced by
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?
Fill in the blank.
Friction depends upon the ............... of an object.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
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.
