Object mass has balance point {mass center} {center of mass} {center of gravity}. In calculations, total object mass can be at mass center.
balance
To find object mass center, hold object at a point off center, allow object to swing freely under gravity until it stops, draw vertical line through point, and repeat for two more points. The three lines intersect at mass center.
spin
Spinning objects spin around mass center.
example
People cannot pick up chairs while standing against walls, because chair-person combination has mass center beyond toes, and so they must tip over.
Physical Sciences>Physics>Matter>Mass
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Date Modified: 2022.0224