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JAMB Physics 2005 Question 26

Question 26

Friction

In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is [g = 10 ms−2]

Diagram for this question
  1. A.15 ms−2.
  2. B.3 ms−2.
  3. C.5 ms−2.
  4. D.9 ms−2.
Show the answer and explanation

Answer: C (5 ms−2.)

Explanation

Friction on the 3 kg block = 0.5 × 30 = 15 N. Net force = 60 − 15 = 45 N on a total mass of 9 kg, so a = 5 m s−2.