Centre of gravity Flashcards – Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028)

What is the centre of gravity of an object?

The point through which its weight may be considered to act.

Where is the centre of gravity of a freely suspended object when it comes to rest?

Vertically below the point of suspension.

How can a plumb line be used to locate the centre of gravity of an irregular plane lamina?

1. Suspend the lamina from a point near its edge and hang a plumb line from the same point.
2. When both are at rest, draw a line on the lamina along the plumb line.
3. Repeat from a different suspension point. The centre of gravity is at the intersection of the lines.

What does the stability of an object describe?

Its tendency to return to its original position rather than topple after being tilted.

How does an object's weight act through its centre of gravity?

It acts vertically through the centre of gravity.

When does an object's weight produce a turning effect that makes it topple?

When the vertical line of action of its weight passes beyond the edge about which it is tipping.

Why is an object with a lower centre of gravity generally more stable than one with the same base and a higher centre of gravity?

It can tilt further before the line of action of its weight passes beyond the base.