Question

In the arrangement shown below, a block of mass M is hung to a spring balance $S_2$ , which in turn is hung to another spring balance $S_1$.
If $T_1$, $T_2$ and $T_3$ represent the tensions, which of the following correctly represents the free body diagram of the three elements of this arrangement?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

The block experiences weight(Mg) in vertically downwards direction. In order to balance the weight, tension $T_1$ is getting applied in vertically upwards direction on the block.

If we talk about spring $S_2$, $T_1$ and $T_2$ are being applied on it.

Similarly, tensions $T_2$ and $T_3$ are being applied on the spring $S_1$.

In other three options, either Mg, $T_1$ ,et cetera is/are missing or the directions of the forces are improper.