p,q,r,are equal blocks of masses in an arrangement as shown observers A,B,C,D,are observing these blocks as shown in figure
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When a force is applied to block A, then A will move with an acceleration.
For the motion of B and C, we need to take A as the reference frame.
A is a non-inertial frame and hence friction forces will act on B and C, in the backward direction.
The magnitude of this force is mass×acceleration.
The force of friction acting on C is equal to the reaction force to gravity applied by B on C multiplied by μ Friction=μmg here g is the acceleration due to gravity.
The maximum driving force should be ≤ frictional force
If we do not want C to slip then the maximum force should be μmg
If we are okay with C to slip, but don't want B to slip then the maximum force should be 2μmg because of the mass kept above B.
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