Physics – 1.5.3 Centre of gravity | e-Consult

The stability of the combined system depends on the combined centre of gravity (CG) of the two blocks and its position relative to the base of support, which is the larger block.

If the CG of the smaller block is directly above the larger block, the combined CG will be very close to the edge of the larger block. This configuration is relatively stable. Any slight movement of the smaller block will have a minimal effect on the overall stability.

However, if the CG of the smaller block is significantly to the side of the larger block, the combined CG will be further away from the edge of the larger block. This makes the system less stable. Even a small nudge to the smaller block could cause the combined CG to move outside the base of support, leading to a loss of stability and potential toppling. The greater the distance of the CG from the base, the less stable the system.