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P3 1.1 Moments
Forces that act on objects have a fixed point e.g
the hinge on a door or the axel of a wheel.
These may make the object rotate.
We call the turning effect of a force the
moment.
The fixed point is called the pivot.…read more

Slide 3

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P3 1.1 Moments
The turning effect/moment can be increased by:
· Increasing the size of the force exerted (e.g
turning the spanner with more energy to undo
a bolt)
· Increasing the distance from the pivot to the
line of action of the force (e.g using a spanner
with a longer handle)…read more

Slide 4

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P3 1.1 Moments
You can work out the moment of a force using
this equation:
Moment = force x perpendicular distance from
the pivot to the line of action
of the force
(Newton metres ,Nm) = (Newtons, N) X (Metres, m)
Also remember moments can act in two ways: clockwise
and anticlockwise…read more

Slide 5

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P3 1.1 Moments
The equation we just looked at can be used to
solve different calculations.
For example:
Q: A force of 50N is exerted on a claw hammer of length 0.30m. Calculate
the moment of the force.
A: We know that the moment = force x perpendicular distance...
Then we have to input the numbers we do know from the question
So:
Moment = 50N x 0.30m = 15Nm…read more

Slide 6

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P3 1.1 Moments
Now, try it yourself. Calculate the moments of these
(remember: moment = force x perpendicular distance...
also remember is it clockwise or anti clockwise?)…read more

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