Why can this duck float?
The duck's density is less than water / it is displacing a volume of water with more mass than itself
Why will this phone sink?
The phone's density is greater than water / it is displacing a volume of water with less mass than itself
How do you calculate denisty?
Mass / Volume
When trying to find the density of an irregular shaped object, how can you find the object's volume?
Submerge in water - record the volume of water displaced
When trying to find the density of a regular shaped object, how can you find the object's volume?
Measure the sides and use geometry to calculate the volume.
When trying to find the density of an object how can you find the object's mass?
Place the object on a top pan balance
When you are pumping up a football, What happens to the gas pressure inside and why?
Increases - because you are adding more particles to the container
If you were to heat a netball, what would happen to the gas pressure inside and why?
It would increase as the particles have more kinetic energy
Why do crisp packets expand on a plane?
The gas pressure outside the crisp packet drops, the volume of the gas inside the crisp packet increases.
Why does the gas pressure decrease when you are higher?
There is less atmosphere above you pushing down
