What are the 7 SI units?
Length(m), Mass(Kg), Time(s), Current(A), Temperature(K), Amount of substance(mol), Luminous Intensity (Cd)
What is the factor for the prefix ‘Peta’
10^15
What is the factor for the prefix ‘Tera’
10^12
What is the factor for the prefix ‘Giga’
10^9
What is the factor for the prefix ‘Mega’
10^6
What is the factor for the prefix ‘Kilo’
10^3
What is the factor for the prefix ‘Deci’
10^-1
What is the factor for the prefix ‘Centi’
10^-2
What is the factor for the prefix ‘Milli’
10^-3
What is the factor for the prefix ‘Micro’
10^-6
What is the factor for the prefix ‘Nano’
10^-9
What is the factor for the prefix ‘Pico’
10^-12
What is the factor for the prefix ‘Femto’
10^-15
What is a Newton in SI units?
Kg m s^-2
What is the definition of homogeneity?
The principle in which all physical equations must be dimensionally consistent. (All units on both sides of the equation must be the same)
What are units that are not SI units called?
Derived units
What 2 things can the principle of homogeneity allow us to do?
- Deduce the units of an unknown value in an equation
- Check that an equation shows a possible physical relationship
What is a scalar quantity?
A quantity with magnitude but no direction
What is a vector quantity?
A quantity with both magnitude and direction.
Is 100m NE a scalar or a vector quantity?
Vector (NE = North East, which is a direction)
Is 50Km a scalar or vector quantity?
Scalar (No direction)
Is +20m/s a scalar or vector quantity?
Vector (+20 = 20 metres per second forwards)
What is the formula for percentage uncertainty?
%U = (Uncertainty/MeasuredValue)*100
What is the formula for absolute uncertainty?
(Σx/n)± (max(x)-min(x))/2
