FrictionHard
Question
A block on a long table is tied by massless ropes to two hanging blocks as in figure. Initially block C is moving downwards with non zero velocity. The static and kinetic friction between block B & table is 0.3 and 0.1 respectively.
Options
A.Acceleration of block C is approx. 0.4 m/s2 downwards
B.Acceleration of block C is approx. 0.43 m/s2 upwards
C.Block C comes to rest after some time
D.Acceleration of block C is zero, all the time
Solution
Apply Newton′s law for the system
mC g − μK mBg − mAg = (mA + mB + mC) a
a =
= − 0.4 ⇒ 0.4 (↑)
Block C will retard and comes to rest after some time
mC g − μK mBg − mAg = (mA + mB + mC) a
a =
= − 0.4 ⇒ 0.4 (↑)Block C will retard and comes to rest after some time
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