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 the platform is

John Perolski
September 03, 2023

 Physics Jamb, Waec, Neco Past Questions & Answers on FRICTIONAL FORCE


QUESTIONS 2. 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 the platform is 

A. 0.16 

B. 0.63 

C. 0.80 

D. 1.60 

E. 2.00 

Ans: 0.16 JAMB 1985


SOLUTIONS 

Mass m = 5kg

Horizontal Force F = P = 8N

Coefficient of limiting friction μ = ?

Where P = applied force

W = R = 5 x 10 = 50N


Frictional force F = μR

R = F - P

50 = μR - 8

50 = μ50 - 8

50+8 = 50μ

μ = 58/50

μ =0.16