Physics Y9 Density and Pressure Flashcards
what is density
a measure of the mass of an object per unit volume of that object
calculate density
mass/volume
how should you put physics answers
Formula, Numbers, Answer, Unit
calculate mass
density*volume
calculate volume
mass/density
what are the main units of mass
gcm⁻³ and kgm⁻³
what can you use to measure density of an irregular object
eureka can
calculate pressure (2 ways)
heightdensitygravity and force/area
what is the gravity of earth
9.8Nkg⁻¹
what do Pascal’s vases show
the width and the volume of the medium has no effect, but only the height makes a difference to pressure
what is the unit for pressure
Pascals(Pa)
how precise should physics answers be
as precise as the least precise number
calculate force
pressure*area
what is the unit for force
Neutons(N)
what happens to an object in fluid if weight = upthrust
it floats
what happens to an object in fluid if weight > upthrust
it sinks
calculate weight of water displaced
weight of the object displacing it
calculate difference in pressure
lengthdensitygravity
calculate upthrust
weight of displaced water
what happens to an object in fluid if weight < upthrust
it is impossible
