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Physics Chapter 5 Summary- Turning effects of Forces by
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# Physics Chapter 5 Summary- Turning effects of Forces

## Moment/Torque

### Moment = Force x perpendicular dist. from the pivot

M = F x d

Pivot/Fulcrum/Hinge

### Principal

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

## Terms

Balanced

clockwise motion

### acwm

anti-clockwise motion

### CG

Center of Gravity

Line of Action

## Center of Gravity

### 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

Eg ^

## Stability

### 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