Mechanics 02/03 - Forces in Equilibrium + Centre of Mass

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Describe the forces acting on an object when it is at rest.

All forces are balanced, to give a resultant force of 0N.

2
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How do force vectors combine?

Their horizontal components and vertical components add, to give a resultant vector.

3
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What is the Centre of Mass?

The point through which an object’s weight seems to act.

4
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How can one find the Centre of Mass of an object?

By hanging an object from different points (at least 2 for a 2D shape, or 3 for a 3D shape), and marking the direction of the force of gravity using a reference mass. The intersection of the lines/planes will give the Centre of Mass.