# Physics Y7

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What Do unbalanced forces do?
Cause a change in the way things move
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How do you measure pressure?
Pascal
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How do you work out a turning moment?
Force x distance (FxD)
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How do you make something turn?
Increase the distance from the pivot
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How do forces come?
In pairs
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What happens when forces are balanced?
The way the object is moving doesn't change
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What is mass?
The amount of matter in an object -measured in KG
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What is weight?
a force on an object due to the pull of gravity Measured in N
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How do you calculate the density of an object?
Mass divided by volume
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What causes an object to float in terms of forces?
If the density of an object is less than the density of the liquid it is placed in it will float
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What is friction?
A force the opposes motion- it slows something down.
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What is friction caused by?
tiny bumps in the surfaces of objects
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How does friction act?
Between two forces that rub together.
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How can you reduce friction in machinery
Using oils and lubricants
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What are the forces involved in rocket flight before lift off?
Weight and Support force
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Does gravity affect your weight of Mass
Weight
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How do you calculate weight?
Mass x gravitational field strength
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What does a satellite with a polar orbit do?
Monitor the weather, observing the Earth's surface and Military uses such as spying.
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What force keeps earth in orbit around the sun?
Gravity
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What happens if a see-saw had two moments?
The see-saw stays still
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What are the forces acting on a rocket at lift off?
Thrust and Weight
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## Other cards in this set

### Card 2

#### Front

How do you measure pressure?

Pascal

### Card 3

#### Front

How do you work out a turning moment?

### Card 4

#### Front

How do you make something turn?

### Card 5

#### Front

How do forces come?