MOMENT = FORCE x DISTANCE
A moment is the turning effect of a force.
It depends on two things:
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Example:
A spanner is pushed with a force of 10 N, 30 cm from the pivot. Find the moment.
Questions:
Calculate the moments of force of the following:
1.
1m
3N
20 cm
2.
6N
4.5 m
3.
0.2 N
Principle of Moments
A system is in equilibrium (balanced) when:
200 cm
60 cm
3.5 N
Example:
James weighs 200 N and sits 1 m from the pivot. Jane weighs 100 N. How far from the pivot must Jane
be to balance the beam?
A cat weighing 50 N is 1 m from the pivot. How far away does a mouse weighing 0.5 N have to be to
balance the beam?