Studied by 6 peoplerelationship between density, mass and volume
density = mass / volume
pressure (solids)
force per unit area
relationship between pressure, force and area
pressure = force / area
unit for pressure
pascals
3 states of matter - most dense to least dense
solid
liquid
gas
1 kg to g
1000
1 m^3 to cm^3
1000000
cm^3 to m^3
10^6
fluid
liquid or gas
what happens to an object when it's immersed in a fluid
the fluid exerts pressure evenly across the whole surface in all directions and squeezes the object so force is created against surfaces and act at right angles to it
relationship for pressure difference
height x density x gravitational field strength
formula for pressure in liquids
pressure difference
does pressure in liquids change with depth
yes
where is pressure highest in a liquid container
at the lowest point it has the highest intensity
what happens to force in deep water
force increases as depth increases
determining density - apparatus
regularly and irregularly shaped objects
suitable liquid
30 cm ruler
vernier caliper
micrometer
digital balance
displacement can (eureka)
measuring cylinders
determining density - regularly shaped objects (variables)
independent variable: type of shape/volume dependent variable: mass
determining density - regularly shaped objects (method)
weight the object on a digital balance
measure its dimensions
repeat and take average before calculating density
determining density - regularly shaped objects (volume of sphere)
4/3π r^3
determining density - regularly shaped objects (volume of cube)
lwh
determining density - regularly shaped objects (volume of cylinder)
π r^2 l
determining density - irregularly shaped objects (variables)
independent variable: different irregular shapes/mass dependent variable: volume of displaced water
determining density - irregularly shaped objects (method)
weight the object on a digital balance
place an empty measuring cylinder below the eureka can's spout
fill eureka can with water
lower object into eureka can
measure volume of displaced water in cylinder
repeat and take average
determining density - irregularly shaped objects (analysis)
volume of water displaced = volume of object
determining density - liquids (variables)
independent variable: volume of water addedd dependent variable: mass of cylinder
determining density - liquids (method)
weigh an empty measuring cylinder on a balance
fill the cylinder with the liquid and note the volume and new reading on the digital balance
repeat and take average
determining density - liquids (analysis)
mass of liquid = mass of cylinder with water – mass of cylinder
determining density - systematic errors
ensure balance is set to 0
determining density - random errors
take repeated readings
place irregular object in displacement can carefully
determining density - safety
glassware
electric shock if water is poured into measuring cylinder while on balance
react to spills
Note
Flashcard