Friction - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 2010

The surfaces of conveyor belts are made rough so as to

A. Protect them while carrying loads
B. Prevent the loads from slipping
C. Enable them to carry more load
D. Make them stronger

Question 27:

• JAMB 2011

Which of the following could be effectively used to reduce friction?

A. Kerosene
B. Grease
C. Water
D. Petrol

Question 28:

• JAMB 2012

When the brakes in a car are applied, the frictional force force on the tyres is

A. Is a disadvantage because it is in the direction of the motion of the car
B. Is a disadvantage because it is in the opposite direction of the motion of the car
C. Is an advantage because it is in the direction of the motion of the car
D. Is an advantage because it is in the opposite direction of the motion of the car

Question 29:

• JAMB 2012

I. The frictional force is independent of the area of the surfaces in conduct
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. I, III and IV
B. I, II and IV
C. I, II and III
D. II, III and IV

Question 30:

• JAMB 2013

The coefficient of friction between two perfectly smooth surface is

A. Infinity
B. One
C. Half
D. Zero