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प्रश्न
Select the correct alternative.
Friction is reduced by
विकल्प
making the surfaces wet
making the surfaces dry
making the surfaces rough
sprinkling sand on the surface.
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उत्तर
making the surfaces wet
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
Fill in the blank.
We use ball bearings to .................. the friction.
Fill in the blank.
.................... is the SI unit of force.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Fill in the blank.
Sliding friction and rolling friction are types of .................. 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?
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
