Coefficient of limiting friction and its determination - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• 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 3:

• 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 4:

• JAMB 1987

The coefficient of static friction between a 40kg crate and concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45o to the horizontal. [G = 10ms-1]

A. 400N
B. 300N
C. 283N
D. 212N

Question 5:

• JAMB 1988

A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms^{[/sup]. If the acceleration due to gravity is 10ms[sup]-1}, the coefficient of friction between the moving mass and the table is

A. 0.02
B. 0.08
C. 0.20
D. 0.80