Density and Pressure Flashcards
What is the formula for density
DENSITY = MASS ÷ VOLUME
MASS = DENSITY ?
MASS = DENSITY × VOLUME
VOLUME = MASS ?
VOLUME = MASS ÷ DENSITY
What is the unit for density
g / cm3 or kg / m3
What is the unit for mass
g or kg
What is the unit for volume
cm3 or m3
How do you find out the volume of an irregular object
volume of irregular objects = volume of overall amount - previous volume (e.g. known volume, 50cm3)
How do you find the mass of a liquid
mass of liquid = mass of overall amount - mass of container
Why do objects float in terms of density
the objects density is less than the liquids density
High density materials are …
… heavy for its size
What do high density molecules and atoms have
a large mass and are tightly packed
What is the formula for pressure
PRESSURE = FORCE ÷ AREA
FORCE = PRESSURE ?
FORCE = PRESSURE × AREA
AREA = FORCE ?
AREA = FORCE ÷ PRESSURE
What is the unit for pressure
N / m2
What is the unit for force
newtons (N)
What is the unit for area
m2
N / m2
Pascals (Pa)
What is ‘concentrating the load’
apply a force over a small area so the pressure becomes higher
What is an example of ‘concentrating the load’
ice skate blades, knife
What is ‘spreading the load’
apply a force over a large area so the pressure becomes smaller
What is an example of ‘spreading the load’
flat shoes that do not leave scuff marks, surf boards
What are fluids
liquids and gases (something that can float)
What can pressure in a liquid do
acts in all directions and increases with depth
