How does knowing why things float or sink help people?
Helps people build boats and other things that will be used in water
What happens when water is displaced?
the water just disappears
something has taken the place of the water
the water is lost
If the object weighs the same as the water that has been displaced, does it float or sink?
floats
Do all heavy things sink?
No
Why do big, heavy ships float?
Due to the shape of the base of the ship.
Because they are made of metal.
A ship has special weights in it.
Why will a boat sink if it has a hole in it?
The hole will allow water to get into the boat.
Most fish have airbags called:
life jackets
tubes
lungs
swim bladders
What happens to fish when their airbags are full of air? Do they float or sink?
They float to the surface.
What is a life jacket full of that makes it float?
weights
rocks
air
