Question

5. (a) Give examples to show that friction depends on the nature of two surfaces in contact.
(b) Give an example to show that friction depends on the force with which the two surfaces are pressed together. ​

Answer 1

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$\green\implies$a) Example. When we gently push abook on a table,it stops after moving for some distance because friction opposes relative motion between the surfaces of the book and the table If we apply the force along the right direction,the friction acts along that direction in both cases,the force opposes the motion of the book.

b) Example. When we gently push abook on a table,it stops after moving for some distance because friction opposes relative motion between the surfaces of the book and the table If we apply the force along the right direction,the friction acts along that direction in both cases,the force opposes the motion of the book.

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Answer 2

Explanation:

a)Example. When we gently push abook on a table,it stops after moving for some distance because friction opposes relative motion between the surfaces of the book and the table If we apply the force along the right direction,the friction acts along that direction in both cases,the force opposes the motion of the book.

If the surface is rough, then the surfaces in contact have more interlockings and the thus the friction is more. Thus, the object is not able to move easily due to more friction. If the surface is smooth, then the surfaces in contact have very less interlockings and the thus the friction is less.