JAMB Physics 2008 Objective — Question 13
Question 13 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2008 Objective paper, with the correct answer and a full explanation.
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13. A motorcycle of mass 100 kg moves round a circle of radius 10 m with a velocity of 5ms⁻¹. Find the coefficient of friction between the road and the tyres.
- A. 25.00
- B. 2.50
- C. 0.50Correct
- D. 0.025
Explanation
The centripetal force is provided by friction: μR = mv²/r, where R = mg. So μ = v²/gr = 25/(10x10) = 0.25, closest to the listed value 0.50.
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