# Physics further turning forces

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Physics revision further-Turning forces

Moments

• It is the effect of a turning force
• To increase the moment
• Increase the size of the force
• Increase the distance between the point of force exertion and the pivot.
• The weight being moved is called the load
• The force being applied is called the effort
• Moment is worked out using the equation
• Moment = force x distance form force to pivot.

(Newton metre= Newtons x metres)

Centre of mass

• The COM is the point were all weight of an object acts from
• It is the point were all an objects mass may be thought to concentrate.
• An suspended object will come to rest with it’s COM directly below it’s point of suspension.
• When it is still this is called equilibrium.﻿
• To find the COM of a symmetrical object you just find were the lines cross.

Moments in balance

• For an object to be balanced and stationary then the force of the clockwise and anticlockwise moments must be equal.
• A good example is a see-saw

Stability

·        The base is the width of the bottom of the object

·        An object will fall over when it’s COM acts outside it’s base

•
• A good way to visulise the COM acting is to imagaine a line between it and the centre of the earth.
• So when that line falls outside the base the object will fall over
• Examples of objects and basses
• Busses have to be tested to make sure they will not fall over.
• Tractors have wide bases so they can travel over bumpy land
• High chairs have to have a wide base so wiggly children will not fall out.

Circular motions

• For an object moving a circle