STANDARD Physics Newton's Second Law MCQ Question
A mass of 1 kg is suspended by means of a thread. The system is (i) lifted up with an acceleration of 4.9 m s⁻² (ii) lowered with an acceleration of 4.9 m s⁻². The ratio of tension in the first and second case is
3 : 1
1 : 2
1 : 3
2 : 1
Correct Answer
Detailed Explanation
Using Newton's second law of motion, for case (i), T₁ = m(g + a) and for case (ii), T₂ = m(g - a). The ratio T₁/T₂ = (g + a)/(g - a) = (9.8 + 4.9)/(9.8 - 4.9) = 3/1.
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