Question
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A tall, narrow display stand holds a heavy screen high up on a small base. It stands still until a child pushes the top, when it topples over. In terms of equilibrium, why does it topple?
ABCD
The push creates a turning moment about the base edge that the stand's weight can no longer balance, so rotational equilibrium is lost
The push exceeds the tensile strength of the stand, so it fractures rather than tips
The stand tips because a low centre of gravity over a small base is inherently unstable
A tall stand can never be in equilibrium, so it was always going to fall
