Centre Of Mass
Centre of mass (CM) = point where the whole weight (W) of the object acts (aka the point at which the object balances.
CM of a symmentrical object is found along the axis of symmetry. When an object has several axis of symmetry, it's where the lines meet.
REMEMBER EXPERIMENT: SUSPENDED PAPER, PLUMBLINE
- centre of mass is directly below point of suspension and when a plumbline is placed in the same position as the suspended object, the centre of mass is somewhere on the line created by the plumbline.
- by moving the object round and keeping the plumbline stationary, multiple lines will be drawn.
- the centre of mass is where all of the lines meet.