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Give scientific reasons :

(1) We use many simple machines in our day-to-day life.

(2) Less force is required to fit a screw than to hammer a nail.

(3) Big vehicles easily climb up and down the mountains than a pathway.

(4) Oil or lubricant is released between parts of machine.

(5) Machines are covered when not in use.

(6) How are machines protected from the effect of weather?

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(1) Simple machines can be handled easily and there are less chances of these machines breaking down or getting damaged. 

Hence,

We use many simple machines in our day-to-day life.

(2) (i) A screw is like a rolled-up inclined plane of an iron strip. 

(ii) When a screw is fitted in wood it goes in as if it is going down an inclined plane. 

(iii) Therefore, less force is required to fit a screw than hammer a nail.

(3) A winding road or ghat that goes up a mountain is like an inclined plane wrapped around the mountain. It helps big vehicles to climb, up and down the mountain easily.

(4) Oil or lubricant is released between parts that rub against each other so that there is less friction between them and wearing is reduced.

(5) Machines are covered when not in use to prevent dust settling on them.

(6) To prevent the effect of weather, metallic parts in a machine are painted externally and the machines are always kept dry.

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