JAMB Physics 2012 Objective — Question 12

Question 12 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2012 Objective paper, with the correct answer and a full explanation.

The diagram above shows a wooden block just about to slide down an inclined plane whose inclination to the horizontal is α. The coefficient of frictional force between the block and the plane is

A. sinα
B. tanαCorrect
C. cotα
D. cosα

Explanation

At the point of sliding, the coefficient of friction μ = tanα, where α is the angle of inclination.

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