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Standard XII

Physics

Third Law of Motion

The figure sh...

Question

The figure shows a heavy block kept on a frictionless surface and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F₁ and F₂ be the magnitudes of the forces exerted by right rope and the left rope on the block, respectively.
Figure

(a) F₁= F₂ = F for t < 0
(b) F₁= F₂ = F + mg for t < 0
(c) F₁= F, F₂ = F for t > 0
(d) F₁ < F, F₂ = F for t > 0

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Solution

(a) F₁= F₂ = F, for t < 0

At t < 0, the block is in equilibrium in the horizontal direction.
So, F₁= F₂ = F
At t > 0, F₂= 0 and F₁= F.

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(a) F1 = F2 = F, for t < 0 At t < 0, the block is in equilibrium in the horizontal direction. So, F1 = F2 = F At t > 0, F2 = 0 and F1 = F.

(a) F₁= F₂ = F, for t < 0

At t < 0, the block is in equilibrium in the horizontal direction.
So, F₁= F₂ = F
At t > 0, F₂= 0 and F₁= F.