Study about frictional force from every day life. Where is it useful and harmful? Explain.
Answers
Answer:
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.
Explanation:
we can walk,drive bcozz of friction
it is harmful for machines ...