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Question

Find the force of interaction between 2 kg and 3 kg. (Assume all surface are smooth)


Your Answer
A
2 N
Correct Answer
B
7 N
Your Answer
C
8 N
Your Answer
D
10 N

Solution

The correct option is B 7 N
Considering horizontal motion,

a=Total forceTotal mass=20cos6010=1010=1 m/s2

1 kg block on top of 4 kg block is not subjected to any force in the horizontal direction. Hence its mass is not taken into account when considering the total mass.

Considering 3 kg and 4 kg as a system
FBD of the system as shown below gives,

N1=ma=7×1=7 N

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