# Unit 1.1 Physics

Quantity
In S.I. a quantity is represented by a number x a unit
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Scarlar
A scalar is a quantity that has magnitude only
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Vector
A vector is a quantity that has magnitude and direction
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Resolving a vector into components in particular directions
This means finding vectors in these directions, which add together vectorially to make the original vector.
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Density of a material ρ
density= mass/volume
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Moment of a force
The force x the perpendicular from the point to the line of action of the force. (i.e. moment= F x d) (Unit: Nm)
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The principle of moments
For a system to be in equilibrium, the resultant anti-clockwise moments = resultant clockwise moments about the same point
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Centre of gravity
The centre of gravity is the single point within a body at which the entire weight of the body may be considered to act
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## Other cards in this set

### Card 2

#### Front

A scalar is a quantity that has magnitude only

Scarlar

### Card 3

#### Front

A vector is a quantity that has magnitude and direction

### Card 4

#### Front

This means finding vectors in these directions, which add together vectorially to make the original vector.

### Card 5

#### Front

density= mass/volume