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प्रश्न
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
विकल्प
increased friction between the road and the tires.
lubrication of brakes on a wet road.
reduced friction between the road and the tires.
streamlined shape of the car
उत्तर
reduced friction between the road and the tires.
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संबंधित प्रश्न
Fill in the blank.
We use ball bearings to .................. the friction.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank.
Rolling friction is ........... than sliding friction.
In figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
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.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
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.
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
