3.2.5 Moments

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What is a moment?
Moments
Learning Outcomes
C: Define the principle of moments
B: Use moments to solve simple problems
A/A*: Apply principle of moments to investigation.
Principle of moments
Moment = force x perpendicular distance
Moment = Fd
sum of anticlockwise moments
= sum clockwise moments
F1 x d1 = F2 x d2
sum of anticlockwise moments
= sum clockwise moments
F1 x d1 = (F2 x d2) + (F3 x d3)
1. By taking moments about point S, show that the weight,
W, of the rod is 0.12N
2. What is the tension in the supporting thread?
5
6
A couple is two equal forces which act in opposite directs on
an object but not through the same point so they produce a
turning effect.
Moment of Couple = Fs
7
Horizontal Component
Vertical Component
8
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