PHYSICS

JAMB 2000 - Question 3

Physics 2000 JAMB Past Questions - Question 3: I. The frictional force is independent of the area of the surfaces in contact. II. The frictional force depends on the nature of the surfaces in contact. III. The frictional force depends on the speed of sliding. IV. The frictional force is directly proportional to the normal reaction. .Which combination of the above is true of sliding friction?

I. The frictional force is independent of the area of the surfaces in contact. II. The frictional force depends on the nature of the surfaces in contact. III. The frictional force depends on the speed of sliding. IV. The frictional force is directly proportional to the normal reaction. .Which combination of the above is true of sliding friction?
A:
B:
C:
D:
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Correct Answer

D

Explanation

The combination of statements that is true for sliding friction is:

II. The frictional force depends on the nature of the surfaces in contact.
III. The frictional force depends on the speed of sliding.The correct combination of statements that is true of sliding friction is:

II. The frictional force depends on the nature of the surfaces in contact.
III. The frictional force depends on the speed of sliding.
IV. The frictional force is directly proportional to the normal reaction.

So, the correct combination is II, III, and IV.
IV. The frictional force is directly proportional to the normal reaction.

I. The frictional force is independent of the area of the surfaces in contact is not accurate for sliding friction. Sliding friction depends on the nature of the surfaces, the speed of sliding, and the normal (perpendicular) force applied, but it is not directly influenced by the area of the surfaces in contact.