Question

list few uses of friction

Answer 1

moving of vehicles
working of machines
walking on street

Answer 2

Frictional forces

Whenever an object moves against another object, it feels frictional forces. These forces act in the opposite direction to the movement. Friction makes it harder for things to move.

Helpful frictional forces

Friction can be useful:

friction between our shoes and the floor stop us from slipping

friction between tyres and the road stop cars from skidding

friction between the brakes and wheel help bikes and cars slow down

Frictional forces are much smaller on smooth surfaces than on rough surfaces, which is why we slide on ice.

Unhelpful frictional forces

Friction can also be unhelpful. If you don't lubricate your bike regularly with oil, the friction in the chain and axles increases. Your bike will be noisy and difficult to pedal.

When there is a lot of friction between moving parts, energy is lost to the surroundings as heat. Think of what happens when you rub your hands together quickly. The friction warms them up.













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