Quantities,units,vectors,scalars,practical skills Flashcards
What are the seven quantities fundamental to physics..
mass
length
time
temperature
current
amount of substance
luminous intensity
What are the base quantities
What are the derived units
What are the standard prefixes
What are vectors
Physical quantities that have magnitude and direction
What are scalars
Physical quantities that only have magnitude
What is displacement
The overall distance travelled from the starting position
When adding scalars…
normal arithmetic is applied
What is the formula to work out the horizontal component
Fh=Fcosθ
What is the formula to work out the vertical component
Fv=Fsinθ
What is an Error
The difference between a measured result and the true value
An error can be due to…
Random or systematic
What is precision
the consistency between values obtained by repeated measurements
What is accuracy
How close the measured value is to the true value
What is the formula to work out percentage uncertainty for 1 value
(absolute uncertainty/value) * 100
What is the formula to work out the absolute uncertainty for repeated values
Range/2
What is the formula to work out the percentage uncertainty for repeated values
(absolute uncertainty/mean value) * 100
If quantities are added or subtracted then___
add the absolute uncertainties of each quantity
If quantities are multiplied or divided then___
add the percentage uncertainties of each quantity
If a quantity is raised to a power then___
multiply the percentage uncertainty by the power
What is the formula to work out the absolute uncertainty for 1 value
absolute uncertainty=resolution
What is a reading
A value found from a single judgement
What is a measurement
Requires the value to be taken from two readings or judgements
