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What are the two forces acting on an object in water?
Gravity and upthrust
What is upthrust?
Upthrust is the upward force from water
Who discovered displacement?
Archimedes
What force pulls objects down?
gravity
What does floating mean?
Floating mean staying on the surface of water
What does sinking mean?
Going down to the bottom of the water
Which force pushes objects up in water?
upthrust
What happens when gravity is stronger than upthrust?
The object sinks
What happens when upthrust is equal to gravity?
The object floats
What is displacement?
Displacement is when water is pushed a side by an object
Does a heavier object always sink?
No shape also matters
How does mass affect floating?
More mass increases weight and may cause sinking
How does shape affect floating ?
Wide and hollow shapes float better
What shape helps objects float better?
Wide and hollow shapes
Why do ships float even though they are heavy?
They displace a large amount of water
What force diagram shows floating ?
Equal length arrows for gravity and upthrust
