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Question

Find the force of interaction between 3 kg and 2 kg (Assume surfaces are frictionless )

A
2 N
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B
3 N
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C
8.6 N
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D
5 N
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Solution

The correct option is C 8.6 N
Considering horizontal direction motion, net horizontal force on the combined system is as shown in figure.
Net force on (3 kg and 2 kg) as system is
Fnet=6 N to the left
Hence,
a=Fm=65=1.2 m/s2

FBD for 3 kg block,

N15=ma=3×1.2
N1=5+3.6=8.6 N

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