Car is accelerating with acceleration = 20 m/s 2 . A box of mass m = 10 kg that is placed inside the car, it is put in contact with the vertical wall of car as shown. The friction coefficient between the box and the wall is µ = 0.6.
A
The acceleration of the box will be 20 m/sec 2
B
The friction force acting on the box will be 100 N
C
The contact force between the vertical wall and the box will be 100 
N
N
D
The net contact force between the vertical wall and the box is only of electromagnetic in nature.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c, d) The breaking force is insufficient, so the block will not slide.
So, friction force = 100 N
and acceleration will be 20 m/sec 2 only
Net contact force on the block = 
= 100 
N
All mechanical interactions are electromagnetic at microscopic level.
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