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A moment is the turning effect of a force (e.g
undoing a wheel-nut with a spanner)
The moment of this example can be increased by...
1. Increasing the size of the force.
2. Using a spanner with a longer handle.
The equation is... Moment of a
force = force X perpendicular
distance from pivot to the line of
action of the force.…read more

Slide 4

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Is the point at which all the mass of the object
is thought to be concentrated.
· Equilibrium is when an object's COM is
directly beneath the point of suspension.
Point of
suspension. Centre of
mass (COM).…read more

Slide 5

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For something to balance, the anticlockwise and
clockwise moments must be equal. Using the
example of a seesaw, this might be achieved by...
1. Heavier person moving closer to the pivot.
2. Lighter person sitting further away.
3. Using same weight people, same distance form
pivot.
he
The sum of t
This is a loc k w is e m oments
n c
the
exampl
e of = the sum of
e
`princip
le of anticlockwis
momen
ts' moments.…read more

Slide 6

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The stability of an object is how easily it topples.
· Stability can be increased by...
1. Making the base wider.
2. Making the COM as low as possible.
· An object will topple over when the line of action is
outside the base.
Centre of
mass (COM).
Line of action.…read more

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