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What is friction? How do friction arise? Explain.
Friction is equal and opposite force exerted by relative motion between two surfaces.
The direction of friction is such that it opposes the direction of motion.
Friction acts between two surfaces with irregularities. When these surfaces come in contact their irregularities get locked with each other, and their movement causes friction.
Explain why sportsmen use shoes with spikes.
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?
Explain why sliding friction is less than static friction.
Give examples to show that friction is both a friend and a foe.
Explain why objects moving in fluids must have special shapes.
What is force of friction?
What is the cause of friction between two surfaces?
Which is small sliding friction or static friction?
Which force helps to write by chalk on black board?
Why is it difficult to move on a wet marble floor?
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