Question

Three blocks of masses 6 kg, 4 kg and 2 kg are pulled on a rough surface by applying a constant force 20 N. The values of coefficient of friction between blocks and suface are shown in figure.
Q. Friction force on 4 kg block is
A. `4N`
B. `6N`
C. `12N`
D. `8N`

Answer 1

Correct Answer - D

`T_(2)+4=20,T_(2)=16Nt`

`f_(2)=8,T_(2)=T_(1)+f_(2),T_(2)=T_(1)+8`
`T_(1)=8`

`f_(3)=8`