WAEC Physics 2014 Theory — Question 14
Question 14 of 22 from the West African Examinations Council (WAEC) Physics 2014 Theory paper, with the correct answer and a full explanation.
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8(e). The diagram illustrates a body of mass 5.0kg being pulled by a horizontal force F. If the body accelerates at 2.0ms⁻² and experiences a frictional force of 5N, calculate the: (i) net force on it; (ii) magnitude of F; (iii) coefficient of kinetic friction. [g=10ms⁻²] (6 marks)
Model answer
(i) Net force = ma = 5.0×2.0 = 10N (ii) F − friction = net force ⟹ F − 5 = 10 ⟹ F = 15N (iii) Normal force = mg = 5.0×10 = 50N Coefficient of kinetic friction, μ = friction/Normal force = 5/50 = 0.1
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