give reasons for the following:
(e) Ball bearings are used in machines. ( 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 streamline (1) Metal chains are wrapped on tyres when they run om icy roads 0 Rollers are used for transporting luggage.
Answers
Answered by
3
Explanation:
THESE ALL ARE DUE TO EFFECTS OF FRICTION FORCE
Answered by
5
Answer:
cool
Explanation:
e) Ball bearings are used in machines because to convert the sliding friction into rolling friction that helps to reduce friction..
g) Machine parts are frequently oiled or greased because oils and grease are lubricants which help to reduce friction to ensure a smooth going of machines.
h) Sports cars, aeroplanes and boats have a streamlined shape because it helps to reduce the friction caused by fluids ( drag).
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