Give reasons for the following-
(a) Ball-bearings are used in machines.
(b) Tyres of the vehicles need to be changed regularly.
(c) Machines parts are frequently oiled or greased.
(d) Sport cars, aeroplanes and boats are designed to have a streamlined shape.
(e) Metal chains are wrapped on tyres when they run on icy roads.
(f) Rollers are used for transporting luggage
Answers
Answer:
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Explanation:
1.Bearings Reduce Friction. Bearings are constrained elements used to reduce the friction of certain moving parts in a machirne or device. This is done by replacing sliding friction with rolling friction. ... Roller bearings are used for heavier loads than ball bearings.
2.Tyres of the vehicle are designed to increase the friction between the road and the wheels. Due to wear and tear in the tyre by regular use, the friction between the tyre and road reduces and the tyre becomes more slippery. ... In order to avoid this, we need to change the tyres regularly.
3. Friction occurring in the machines and their components creates heat and hampers the functioning of it. Oil and grease lubricate the machine parts and help in reducing the friction and also a smooth running of the machine.
4.Airplanes are streamlined so that they experience less friction with the air around them as they fly. ... The special shape given to the bodies moving in the fluids like ships in water and aeroplanes in the air to reduce the fluid friction is called streamlined shape.
5. For increasing friction the iron chains are wrapped on the tyres of trucks in icy areas which increases the grip and increase friction which helps the car to stop after apply breaks in icy areas.
6. It is always easier to roll a body than to slide it over a surface. So it is convenient to pull a the luggage fitted with rollers. When one body rolls over the surface of another body, the friction offered is called ROLLING FRICTION. So this is the reason behind rollers are used for transporting luggage.
Explanation:
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