Laws of MotionHard
Question
A string is wrapped round a log of wood and it is pulled with a constant force F as shown in the figure.
Options
A.tension T in the string increases with increase in θ
B.tension T in the string decreases with increase in θ
C.tension T > F if θ > π/3
D.tension T > F if θ > π/4
Solution
F = 2 T cos θ T = 
θ↑ cos θ↓T↑
on increasing θ, cos θ decreases and hence T increases.
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