Topics 1.8 and 1.9 - Centre of Mass and Moments

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What is the centre of mass?
The centre of mass is the point at which the mass of an object is thought to be concentrated
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If freely suspended, what will happen to an object?
If freely suspended, an object will come to rest with it's centre of mass directly below it's point of suspension
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Where is the centre of mass in a symmetrical object?
Along it's axis of symmetry
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What is the relationship between time period and frequency?
Time Period = 1 ÷ Frequency
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What alters the time period of a pendulum?
The time period of a pendulum depends on it's length
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What is a moment?
The turning effect of a force
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What happens if an object isn't turning?
If an object is not turning, the total clockwise moment must be exactly balanced by the total anticlockwise moment about any pivot
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What can be used as a force multiplier?
Simple levers
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What happens if there is a resultant moment?
If the line of action of the weight of an object lies outside the object's base there will be a resultant moment and the body will topple
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Card 2

Front

If freely suspended, what will happen to an object?

Back

If freely suspended, an object will come to rest with it's centre of mass directly below it's point of suspension

Card 3

Front

Where is the centre of mass in a symmetrical object?

Back

Preview of the front of card 3

Card 4

Front

What is the relationship between time period and frequency?

Back

Preview of the front of card 4

Card 5

Front

What alters the time period of a pendulum?

Back

Preview of the front of card 5
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