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Physics Chap 5- Turning Effects of Forces by Mind Map: Physics Chap 5-
Turning Effects
of Forces
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Physics Chap 5- Turning Effects of Forces

Terms

Equilibrium

Clockwise Motion

New node

Anti-clockwise Motion

Center Of Gravity

Line Of Action

Moment/Torque

Turning Effect of A Force

Moment = Force x perpendicular dist. from the pivot

M = F x D

Pivot/ Fulcrum/ Hinge

SI unit = Newton Metre (Nm)

Principle

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

Levers

Enable us to move object with less force

New node

A rod- when force is applied on it, it will help move load

New node, New node

Has a pivot

Center Of Gravity

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)

Regular Objects

Center of gravity is in the center of it

Irregular Objects

1) set up apparatus

2) Hang plumbline in front of laminar

3) Trace the plumbline to laminar

4) Turn the laminar and trace the other edge

The intersection of the lines is the Center of Gravity

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

Concepts

Objects will turn till it reaches a point where there is no moment

If object is hung freely it will always come to rest with its Center of Gravity directly below the Pivot

Stability

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

Types of stability

Stable Equilibrium, Displaced slightly and it is able to maintain its position

Unstable Equilibrium, Displaced slightly and it changes its position, Always try to find a lower Center of Gravity

Neutral Equilibrium, Remains still after being Displaced

Redesign for stability

Lower the Center of Gravity, Increase weight, Change Material, Change to heavier material

Increase Base Area, Change Pivot, Chnage Center of Gravity, Change both

Move Center of Gravity Lower than Pivot

Center of Gravity below PIvot