Science

Friction

Question:

Explain why sliding friction is less than static friction.

Answer:

Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. In sliding, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason, sliding friction is less than static friction.
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Questions and Answers

Friction

Q 1.

static, sliding, rolling
Answer

Q 2.

wet marble floor, dry marble floor, newspaper and towel
Answer

Q 3.

Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Answer

Q 4.

Explain why sliding friction is less than static friction.
Answer

Q 5.

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Answer

Q 6.

Give examples to show that friction is both a friend and a foe.
Answer

Q 7.

You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
Answer

Q 8.

Explain why objects moving in fluids must have special shapes.
Answer

Q 9.

Explain why sportsmen use shoes with spikes.
Answer