Give reason
(e) Ball-bearings are used in machines.
(f) Tyres of the vehicles need to be changed regularly.
(g) Machines parts are frequently oiled or greased.
(h) Sport cars, aeroplanes and boats are designed to have a streamlined shape.
(i) Metal chains are wrapped on tyres when they run on icy roads.
(j) Rollers are used for transporting luggage.
Answers
Answer:
e ball bearing will make movement frictionless, f I think it's not correct to change the tyre but ya we have to careful about how tyre are,g yes because it will allow the movement frictionless, h so that the medium cant affect its movements, i ice is so slippery but the chain provides tyre more friction
Answer:
(e) Ball bearings are used in machines to reduce the friction.
(f) Tyres of vehicles need to be changed regularly because with passing time tyres will become smoother. If it will lose its resistance many accidents may occur.
(g) Machines parts are frequently oiled or greased because to work smoothly and to reduce the friction.
(h) Sports car, aeroplanes and boats are designed to have a streamlined shape because they move at a very fast speed. Hence, to move easily they are designed like that.
(i) Ice is so smooth to increase the friction metal chaines are wrapped.
(j) Rollers roll easily on the ground so we can easily carry the bag to one place to another place.
Explanation:
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