Question

1.
Two blocks of masses 2 kg and 4 kg are connected
by a massless string which is just taut. Now two
forces 3 N and 14 N are applied on blocks. The
tension in the string is
14N A kg
2 kg 3N
u = 0.4
u = 0.3
(1) 24.3 N
(2) 20 N
(3) 6N
(4) Zero​

Answer 1

The net tension in the string is zero.

Option (4) is correct.

Explanation:

Force acting on 2 kg block = f2

Force acting on 4 kg block = f1

Now f2 = umg

             = 0.3 x 2 x 10

             = 6 N ( No movement)

Means f2 is greater than 3N. (f2 > 3N)

Similarly,

f1 = umg

   = 0.4 x 4 x 10

   = 16 N ( No movement)

Means f1 is greater than 14N. (f1 > 14N)

Therefore the net tension in the string is zero.

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