FrictionHard
Question
A force F = t is applied to block A as shown in figure. The force is applied at t = 0 seconds when the system was at rest and string is just straight without tension. Which of the following graphs gives the friction force between B and horizontal surface as a function of time ′t′.
Options
A.
B.
C.
D.
Solution
When F is less than μsmg then tension in the string is zero.
When μsmg ≤ F < μs2mg then friction on block B is static.
If F is further increase friction on block B is kinetic.
When μsmg ≤ F < μs2mg then friction on block B is static.
If F is further increase friction on block B is kinetic.
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