Topic 2: Moments
Moments Triangle:
Principle of moments: The sum of clockwise moments equal the sum of anticlockwise
moments so the object will be balanced.
Unit:
N(distance unit) Ex.
Nm
Ncm
Nmm
Nkm
Unaccepted answers:
nm
NM
nM
etc.
How to calculate:
M=Moments
F=Force
D=Distance
M=F*A
F=M/D
D=M/F
Question Examples;
Example 1:
Missing Measurements
In this question, one half of the see saw is given. The question requires the (N) on the
other half. To solve this, you calculate the moments on the given half which works out
to 60 Nm. Then use that figure to get the N on the other side by dividing 60/1.5 which
will equal 40. The answer is 40N
Example 2:
Basic moments calculation:
In this question, both sides are given. You just need to calculate the moments. In this
case, M=F*D=5*2=10Nm