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?
a ship has special weights in it
a ship's bottom is shaped in a way that displaces water
Why will a boat sink if it has a hole in it?
the hole will let water come into the boat
Most fish have airbags called:
tubes
swim bladders
lungs
life jackets
What happens to fish when their airbags are full of air? Do they float or sink?
float to the surface
What do people use to breathe?
lungs
What should we wear to keep safe in the water?
life jackets
What is a life jacket full of?
rocks
weights
air
