Centre Of Mass
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CENTRE OF MASS
- Centre of Mass An important principle in Physics is that any object, however sophisticated, large, or complex can be treated as a point mass. When we work out the effect of forces, we show the forces all acting at a single point. This point is called the centre of mass. We treat objects as point masses referring to a single point called the centre of mass.
CENTRE OF MASS
- In regular objects like a cube or a sphere, the centre of mass is in the middle. In some objects the centre of mass is outside the object. The centre of mass (or centre of gravity) is the point through which the entire weight is said to act. Objects with a very low centre of gravity tend to be very stable. Some objects are so stable that they never fall over. Objects with a high centre of gravity are unstable.
CENTRE OF MASS UPON A BUS
- If the bus tilts, the line of action will pull the bus upright. Although they are tall, double-decker buses are very stable. They test buses by putting lots of sandbags on the seats upstairs (with nothing downstairs) and tilt them over on a tilting platform. The centre of mass is low enough to ensure that they are tilted to more than 60o off the vertical before they tip over.
CENTRE OF MASS OF A BUS
- Lorries have a higher centre of mass on their trailers, due to the load. If you live in the country and get stuck behind a hay-lorry, you may see it swaying alarmingly. This kind of accident tends to happen with lorries when they drive through strong cross-winds on exposed roads.
