Friction - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 1981

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms² then the angle of inclination \( \theta \) is

A. \( 15^{\circ} \)
B. \( 30^{\circ} \)
C. \( 45^{\circ} \)
D. \( 60^{\circ} \)
E. \( 75^{\circ} \)

Question 2:

• JAMB 1983

Which of the following statements about friction is NOT correct?

A. The force of kinetic friction is less than the force of static friction
B. The force of kinetic friction between two surfaces is independent of the areas in contact provided the normal reaction is unchanged
C. The force of rolling friction between two surfaces is less than the force of sliding friction
D. The angle of friction is the angle between the normal reaction and the force of friction
E. Friction may be reduced by lubriction

Question 3:

• JAMB 1983

a force of 16N applied 4.0kg block that is at rest on a smooth, horizontal surface. What is the velocity of the block at t = 5 seconds?

A. 4ms^-1
B. 10ms^-1
C. 20ms^-1
D. 50ms^-1
E. 80ms^-1

Question 4:

• JAMB 1985

A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is

A. 0.16
B. 0.63
C. 0.80
D. 1.60
E. 2.00

Question 5:

• JAMB 1986

When a box of mass 45kg, is given an initial speed of 5ms^-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms^-2)

A. \( \frac{5}{6} \)
B. \( \frac{5}{12} \)
C. \( \frac{1}{3} \)
D. \( \frac{2}{3} \)