Question

(a) Friction is desirable in some situations and undesirable in some other situations.

(i) Mention two applications where friction is increased by making the surface rough.

(ii) Also mention the name of any two methods which is used to reduce friction whenever it

becomes undesirable.

(b) A box is resting on the floor. To move it, forces of different magnitudes are applied as

shown in the figure.

(i) What is the value of force of limiting friction acting between floor and lower surface of the

box?

(ii) Is this static or sliding friction?​

Answer 1

Answer:

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Explanation:

Friction is desirable in some situations and undesirable in some other situations.

(i) Mention two applications where friction is increased by making the surface rough.

(ii) Also mention the name of any two methods which is used to reduce friction whenever it

becomes undesirable.

(b) A box is resting on the floor. To move it, forces of different magnitudes are applied as

shown in the figure.

(i) What is the value of force of limiting friction acting between floor and lower surface of the

box?

(ii) Is this static or sliding friction?