Answer:
1.While climbing up the stairs, you are moving against gravity, which act towards the centre of the Earth. But while coming down, you are moving towards gravity i.e. towards the centre of the Earth. It is for the same reason that it is easier to cycle downhill that uphill.
2.By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
Explanation:
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