Give reasons for the following :(a ) Footballers use shoes with spikes. (b ) cars having streamline shape give better mileage . (c) one must drive slowly on wet roads. (d) it is easier to pull a suitcase with wheels?.
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(A) Footballers usually use shoes with spikes because they have to run very fast on the field and having spike shoes,they can easily maintain their grip with the ground so they do not get slipped.
B) Cars usually have streamlined shape because having streamlined shape it can easily cut the air pressure or air opposition due to which one can easily drive the car with great speed.
(C) One must drive slowly on wet roads because in dry roads the contact between the two surfaces have more friction whereas in smooth roads the contact between the two surfaces has less friction due to which one might slip on driving faster on these roads.
(E) It is easier to pull a suitcase with wheels because wheels reduces the friction between the suitcase and the surface of contact due to which we can easily pull our suitcase without any difficulty.
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B) Cars usually have streamlined shape because having streamlined shape it can easily cut the air pressure or air opposition due to which one can easily drive the car with great speed.
(C) One must drive slowly on wet roads because in dry roads the contact between the two surfaces have more friction whereas in smooth roads the contact between the two surfaces has less friction due to which one might slip on driving faster on these roads.
(E) It is easier to pull a suitcase with wheels because wheels reduces the friction between the suitcase and the surface of contact due to which we can easily pull our suitcase without any difficulty.
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