Physical quantities and measurements Flashcards
What are all the scalar quantities?
Energy,time,pressure,density,mass,work,power,electrical charge,distance,volume
What is a scalar quantity
A quantity that only has magnitude
What is a vector quantity
A quantity that has both magnitude and direction
What are prefixes used for?
To represent very large and small numbers and express them in a more convenient and manageable way
Unit to unit prefixes do you times or divide?
divide
Unit with prefixes to unit without prefixes do you times or divide?
Times
What are the vector quantities
Displacement,acceleration,force,weight,velocity
What is the period of the pendulum?
The time taken for the pendulum to complete on full oscillation back and fro
What is a physical quantity?
A physical is a quantity that can be measured with a measuring instrument
What are SI unit used for?
They ensure that all measurements around the world are standardised and uniform
What are the Base quantities?
Mass,temperature,time,lenght,current,amount of substance
What are the dervived quantities?
Density,volume,speed
What is a measurement?
It is a quantity that has numerical magnitude and a unit
