Question

1- It is easier to open a bottle cap by gripping it with a towel. why?
2- How does sand paper help in increasing friction?
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Answer 1

(1)      Rough surface of towel helps in increasing friction, and thus provides a better grip. The towel, thus, makes it easier to open the bottle cap.

(2)    A smooth surface can be made rough with the help of sandpaper. There are more irregularities on a rough surface than on a smooth surface. Thus, sand paper helps in increasing friction; by increasing the roughness of a surface.

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Answer 2

Answer:

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☆1st Answer

Rough surface of towel helps in increasing friction, and thus provides a better grip. The towel, thus, makes it easier to open the bottle cap.

☆2nd Answer

A smooth surface can be made rough with the help of sandpaper. There are more irregularities on a rough surface than on a smooth surface. Thus, sand paper helps in increasing friction; by increasing the roughness of a surface.