Physics equations and the things behind them

Physics equations and the things behind them

1. density(kg/m³)=mass(kg)/volume (m³)

   • it does not vary with shape or size
   • what it is made up of
   • determines if it floats or sinks
   • experiments
     • you can measure it in solids or liquids
     • you can use a measuring cylinder to measure liquid density
       • 1ml = 1cm³ then use the mass to calculate it
     • solid cuboid
       • measure length width height and multiply together
     • solid cylinder
       • diameter of circles at the bass halve to get r
         • volume=π X r² X height
     • eureka can
       • fill up to just the spout
         • the object you put in the can will displace the exact volume of itself so use 1ml = 1cm³
           • repeat 3 times and figure out a mean before calculating
       • let it drain before using the measuring cylinder
       • thin string should be used to get the most accurate reading

2. distance travled(m) = speed(m/s) X time(s)

3. acceleration(m/s²) = change in velocity(m/s) / time(s)

4. kinetic energy(j) = 0.5 X mass(kg) X (speed(m/s)²)

5. moles = actual mass/ molar mass