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Measurements are described as physical quantities

 

 There are 7 fundamental units (also called base units)

Units, Quantities, Vectors

Symbol

L/ s/ x

 

t

 

I

 

T

 

n

 

m

 

L

 

Quantity

Displacement/ Length/ Distance

 

Time

 

Current

 

Temparature

 

Amount Of Substances

 

Mass

 

Luminosity

 

Unit

Metre

 

Second

 

Ampe (Am)

 

Kelvin

 

Mole

 

Kilogram

 

Candela

Short Unit

m

 

s

 

A

 

K

 

mol

 

kg

 

              Φ

Derieved Units can be written using combinations of base units

 

Eg: F = ma  => N = kgms-2 

Vectors & Scalars

Scalar

only has a magnitude (size)

Energy
Time
Distance
Speed
Mass
Density

Vector

has a direction and magnitude (size)

Force
Velocity
Displacement
Acceleration (Decceleration)
Current

Adding vectors is different to adding scalars

Eg: I walk 3m towards and 2m backwards

 

Resultant Displacement: 1m fowards

3m

2m

1m fowards

Distance: 5m

Adding vectors - finding a resultant vector

End to end

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