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Polishing Surfaces in Contact to Change Friction

Brakes of a v...

Question

Brakes of a very small contact area are not used, although friction is independent of area. It is because friction:

A

depends on the nature of the material

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B

causes wear and tear

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C

resists motion

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D

operating in this case is sliding friction

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Solution

The correct option is C causes wear and tear
Brakes of a very small contact area are not used, although friction is independent of area.
The above condition is because friction causes wear and tear.
It is a known fact, therefore, the correct option is $B$ .

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Similar questions

Q. Which of the following statements regarding laws governing the friction between dry surfaces are correct?

1. The friction force is dependent on the velocity sliding.
2. The friction force is directly proportional to the normal force.
3. The friction force is dependent on the materials of the contact surfaces.
4.The friction force is independent of the area of contact

Select the correct answer using the codes given below

Q. Viscous force a is similar to friction in solids ,but viscous force
a. is independent of area but friction depends on area
b. is temperature dependent while friction force between solids depends upon normal reaction
c. is velocity dependent while friction is velocity independent

Q. Assertion :Static frictional force is self adjusting, for the given two surfaces Reason: Sliding frictional force between two given solid surfaces in independent of surface area of contact.

Fill in the blanks.

(a) Friction opposes the ________ between the surfaces in contact with each other.

(b) Friction depends on the _________ of surfaces.

(c) Friction produces _________.

(d) Sprinkling of powder on the carrom board ________ friction.

(e) Sliding friction is ________ than the static friction.

Q. Fill in the blanks
(a) Friction opposes the .............. between the surfaces in contact with each other.
(b) Friction depends on the ............... of surfaces.
(c) Friction produces ................... .
(d) Sprinkling of powder on the carrom board ................. friction.
(e) Sliding friction is ................ than the static friction.

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