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P3 1 Summary
Turning forces
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P3 1 Summary
What is a moment?
· A moment is the turning effect of a force.
· Moment = force × perpendicular distance
from the pivot to the line of action of the force
=F×d
· F is the force in newtons.
· d is the perpendicular distance from the pivot
in metres.
· The unit of a moment is newton metres (Nm).
AQA Science © Nelson Thornes Ltd 2006…read more

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P3 1 Summary
Using levers
· Calculating moments is
important when you use levers.
· The weight is called the load.
· The force you apply to the
crowbar is the effort.
· The point about which the
crowbar turns is the pivot.
· Levers enable you to lift heavy
loads with little effort.
AQA Science © Nelson Thornes Ltd 2006…read more

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P3 1 Summary
Higher
What can you say about the moments
of the forces acting on an object in
equilibrium (it isn't turning)?
The sum of the anticlockwise moments
about any point
=
the sum of the clockwise moments
about that same point.
AQA Science © Nelson Thornes Ltd 2006…read more

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P3 1 Summary
Higher
Balancing the seesaw
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