A string passes over a smooth pulley and carries a 3kg mass at one end and a 5kg mass at the other end. The acceleration of the masses is:
Correct answer: A. 2.45 ms-2
- A. 2.45 ms-2
- B. 0.25 ms-2
- C. 4.9 ms-2
- D. 2.8 ms-2
Explanation
F=ma F is resultant force Force by 3 kg mass is 3 x 9.81 = 29.43 N BY 5 kg mass is 5 x 9.81 = 49.05 NThe resultant force is 49.05-29.43 = 19.62N19.62/8 (total mass ) =2.45 ms^-2
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About Newton's Laws of Motion
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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