There are a couple of very important things you need to remember about gravity. The rest will have no consquence to us simpltons
Fluids: the lightest will float to the top and the heaviest will sink to the bottom. Fluids will also push solids that are less dense to a place of equilibrium. Don't go swimming with with lead in your pockets.
Solids; all you need to remember here is that a house brick or similar dropped from 1 metre on to your toe will hurt much more than an empty cardboard box of the same dimensions.
I can probbable apply this anology to another forum item on the speed of telescope mirrors a 10" F20 mirror dropped from 20 metres will hit the groud with the same speed as an 10" F2.4 mirror dropped from the same height and will do about the same amount of damage.
Barry
