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Physics Chapter 5 Summary- Turning effects of Forces by Mind Map: Physics Chapter 5 Summary-
Turning effects of Forces
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Physics Chapter 5 Summary- Turning effects of Forces

Moment/Torque

A turning effect of a force

Moment = Force x perpendicular dist. from the pivot

M = F x d

Pivot/Fulcrum/Hinge

SI unit : Newton meter (Nm)

Either clockwise or anti-clockwise

Principal

When an object is in equilibrium, the ∑ cwm = ∑ acwm

Terms

Equilibrium

Balanced

cwm

clockwise motion

acwm

anti-clockwise motion

CG

Center of Gravity

LoA

Line of Action

Levers

A rod that when applied force to, it will help to move a load

All have a pivot

Enable us to move objects with less force

Center of Gravity

The point where gravity acts on an object

If the LoA of the object doesn't go through the pivot, there is a moment (it turns)

the object will turn until there is no more moments

Regular Objects

CG is in the center on it

Irregular Objects

1) Set up apparatus

2) Hang plumbline in front of the laminar

3) Trace the plumbline onto the laminar

4) Turn the laminar and trace another edge

The intersection of the lines is the CG

Video: http://www.youtube.com/watch?v=R8wKV0UQtlo&feature=related

Eg ^

Stability

the measure of a body's ability to maintain its position

Types of stability

Stable Equilibrium, Displaced Slightly and it is able maintain position

Unstable Equilibrium, Displaced Slightly and changes position, It will always will try to find a lower CG

Neutral Equilibrium, Remains still after being displaced

Redesign for Stability

Lower the CG, Add weight, Change material, Increase the weight, Change to heavier material

Increase base area, To change pivot and CG, Change pivot, change CG

So that CG is lower that the pivot, More Stable equilibrium

Move CG below pivot