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# S. Coghlan PowerPoint PPT Presentation

Physics 12. Forces and Equilibrium. Concept Map. S. Coghlan. 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. Printer friendly version available from my web site.

S. Coghlan

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#### Presentation Transcript

Physics 12

Forces and

Equilibrium

Concept Map

S. Coghlan

Understand how the various different parts of forces and equilibrium link together.

Study the whole section of work.

Main Concepts

Printer friendly version available from my web site

S. Coghlan

Principal of moments

CM = ACMTorque F x d

Centre of massCentre of gravity

Equilibrium

may producehave

involves

show

Forces and Equilibrium

Centre of mass

Centre of gravity

Torque

F x d

Principal of moments

have

may produce

involves

show

Equilibrium

Forces and Equilibrium

• CM = ACM

• FV = 0 FH = 0

• M = 0

StableNeutralUnstable

rotational equilibrium

typesconditions

Centre of gravity

Torque

F x d

Centre of mass

Principal of moments

have

may produce

involves

show

Equilibrium

Forces and Equilibrium

CM = ACM

Centre of gravity

rotational

equilibrium

Torque

F x d

Centre of mass

Principal of moments

Stable

have

may produce

involves

types

Forces and Equilibrium

show

Equilibrium

Neutral

conditions

Unstable

 FH = 0

 FV = 0

 M = 0

Single page concept map

The End

Forces and

Equilibrium

Concept Map

S. Coghlan

Main Concepts

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.

• Principal of moments

• CM = ACMTorque F x d

• Centre of massCentre of gravity

• Equilibrium

• CM = ACM

• FV = 0 FH = 0

• M = 0

StableNeutralUnstable

may produce

involveshave

show

rotational equilibrium

typesconditions

strain

Printer friendly version available from my web site

Printer friendly version available from my web site

Equilibrium

CM = ACM

Centre of gravity

rotational

equilibrium

Torque

F x d

Centre of mass

Principal of moments

Stable

have

may produce

Neutral

involves

types

Structures & Materials

show

Equilibrium

conditions

Unstable

 FH = 0

 FV = 0

 M = 0

Centre of Mass =

Centre of gravity

Centre of Mass 

Centre of gravity

1 m

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

Force

Torque

= F x d

Lever

d

Lever

d

Pivot Point

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

Neutral

equilibrium

Unstable

equilibrium

Stable

equilibrium