Physics 12
This concept map is designed to help you;
Understand how the various different
parts of forces and equilibrium link
together.
Study the whole section of work.
Main
Concepts
Linking
words
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version available
from my web site
S. Coghlan
Principal of moments
CM = ACM
Torque F x d
may produce
Centre of mass
Centre of gravity
involves
show
Equilibrium
Forces and Equilibrium
have
Centre of mass
Centre of gravity
Torque
Fxd
Principal of moments
have
may produce
involves
Forces and Equilibrium
show
Equilibrium
CM = ACM
FV = 0
rotational equilibrium
 FH = 0
types
conditions
M = 0
Stable
Neutral
Unstable
Centre of gravity
Torque
Fxd
Principal of moments
Centre of mass
have
may produce
involves
Forces and Equilibrium
show
Equilibrium
CM = ACM
Centre of gravity
rotational
equilibrium
Torque
Fxd
Principal of moments
Centre of mass
have
may produce
Stable
involves
Forces and Equilibrium
show
Equilibrium
types
Neutral
conditions
Unstable
 FH = 0
 FV = 0
M=0
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map
Single page
concept map
S. Coghlan
Main Concepts
Principal of moments
CM = ACM
Torque F x d
Centre of mass
gravity
Centre of
You can use these Main Concepts
and Linking Words to complete your
own concept map. You can print out
the next page and use it as a
framework.
Equilibrium
Linking Words
CM = ACM
FV = 0
 FH = 0
M = 0
Stable
Neutral Unstable
Printer friendly
version
available from
my web site
may produce
involves
have
show
rotational equilibrium
types
strain
conditions
Printer friendly
version available
from my web site
Equilibrium
CM = ACM
Centre of gravity
rotational
equilibrium
Torque
Fxd
Principal of moments
Centre of mass
have
may produce
Stable
Neutral
involves
Structures & Materials
show
Equilibrium
types
conditions
Unstable
 FH = 0
 FV = 0
M=0
Centre of Mass =
Centre of Mass 
Centre of gravity
Centre of gravity
1m
Uniform object geometrical centre.
Gravitational field
strength, g, is the same
everywhere for the body.
Object is so large that the
gravitational field strength
may not be the same
everywhere over the body.
Torque
Force
Torque
Lever
d
=Fxd
Pivot Point
Lever
d
Pivot Point
d is always at right angles to the line of action of the force
If slightly pushed, and released;
returns to its
original position
remains
displaced
continues to
move and c of m
lowers
Stable
equilibrium
Neutral
equilibrium
Unstable
equilibrium