Floating and sinking are determined by an object's density. Objects with high density will sink, while objects with low density will float. Density refers to the amount of mass in a given volume - objects with more mass packed into the same space have higher density. Trapped air can also allow objects to float, as air has low density, so objects filled with air displace more water and experience upthrust force from the water. Changing an object's shape, such as making it hollow, reduces its density and allows it to float.
Floating & Sinking, buoyant forces, displacement, density, volume, mass. All explained thoroughly and simplified for ESL learners at International Schools. Question slides refer to the book Interactive Physical Science.
Floating & Sinking, buoyant forces, displacement, density, volume, mass. All explained thoroughly and simplified for ESL learners at International Schools. Question slides refer to the book Interactive Physical Science.
3. What does
floating and
sinking mean?
I think floating means that an
item is on or under the surface.
I think sinking means when an
item sinks all the way to the
bottom.
6. Questions
• How does an item float ?
• How does it sink?
• Does density make objects float?
7.
8. • Density is in every type of object that has
any kind of material. High density objects
will sink and low density object will float.
9. Does density have the ability
to make an item float?
• Density is in every type of object that has
any kind of material. High density objects
will sink and low density object will float.
12. Diagram
When we pushed the
balloon under the water,
the water pushed back.
This is called upthrust .
13. Diagram
The water rose when
we pushed the balloo
down.
When we pushed the
balloon under the water,
the water pushed back.
This is called upthrust .
14. Diagram
The water rose when
we pushed the balloo
down.
When we pushed the
balloon under the water,
the water pushed back.
This is called upthrust .
As we pushed the balloon under the water, some of the water pushed out of
the way. The water levels rose. This is called displacement
15. Diagram
The water rose when
we pushed the balloo
down.
The balloon floats
When we pushed the on the water
balloon under the water, because it is filled
the water pushed back.
This is called upthrust . with air.
As we pushed the balloon under the water, some of the water pushed out of
the way. The water levels rose. This is called displacement
16.
17. • First we cracked the egg
and tipped the yolk out.
Then we tipped the first
egg white in to see if it
floated. It didn’t. Then
you whisk the the other
egg white and pour it in
the water. It will float
because we have added
air.
18. Trapped air
• First we cracked the egg
and tipped the yolk out.
Then we tipped the first
egg white in to see if it
floated. It didn’t. Then
you whisk the the other
egg white and pour it in
the water. It will float
because we have added
air.
19. Trapped air
• First we cracked the egg
and tipped the yolk out.
Then we tipped the first
egg white in to see if it
floated. It didn’t. Then
you whisk the the other
egg white and pour it in
the water. It will float
because we have added
air.
20. Changing an object’s shape
If you change an object’s shape and make it
hollow it will float. A flat dense object will
sink, but if it’s flat it will actually sink.