Comparing Cubes
Sofia has two solid cubes made of the same
material. One cube is very large, and the
other cube is very sm...
ReviewReview
Density
A measure of how much matter
(mass) is contained in a volume of
a material
How much “stuff” is in ...
BuoyancyBuoyancy
An upward force on an
object in water equal to
the weight of the water
the object pushes out of
the way
BuoyancyBuoyancy
Example:
Clay ball
It sinks in
water
Force of
Gravity
Buoyan
t Force
BuoyancyBuoyancy
If the buoyant force is less
than the objects weight
The object sinks
Negative buoyancy
BuoyancyBuoyancy
Flatten the
clay out
Shape it
like a boat
It floats
Force
of
Gravity
Buoyan
t Force
BuoyancyBuoyancy
If the buoyant force is
equal to the objects weight
The object floats
Positive buoyancy
BuoyancyBuoyancy
Neutral buoyancy?
An object seems to
be suspended in a
liquid
BuoyancyBuoyancy
If the objects density is less
than 1 g/cm3
, it floats in water
If an objects density is
greater than ...
BuoyancyBuoyancy
All this applies to
other liquids
And gasses too!!
Force
of
Gravity
Buoyan
t Force
of Air
Bob’s
homemade
buoyancy
control device
still needed
some minor
tweaks.
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Buoyancy

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Buoyancy

  1. 1. Comparing Cubes Sofia has two solid cubes made of the same material. One cube is very large, and the other cube is very small. Which statement below is true? A. The density of the larger cube is greater than the density of the smaller cube. B. The density of the larger cube is less than the density of the smaller cube. C. The density of the larger cube is the same as the density of the smaller cube.
  2. 2. ReviewReview Density A measure of how much matter (mass) is contained in a volume of a material How much “stuff” is in the “space” of an object D = m/V
  3. 3. BuoyancyBuoyancy An upward force on an object in water equal to the weight of the water the object pushes out of the way
  4. 4. BuoyancyBuoyancy Example: Clay ball It sinks in water Force of Gravity Buoyan t Force
  5. 5. BuoyancyBuoyancy If the buoyant force is less than the objects weight The object sinks Negative buoyancy
  6. 6. BuoyancyBuoyancy Flatten the clay out Shape it like a boat It floats Force of Gravity Buoyan t Force
  7. 7. BuoyancyBuoyancy If the buoyant force is equal to the objects weight The object floats Positive buoyancy
  8. 8. BuoyancyBuoyancy Neutral buoyancy? An object seems to be suspended in a liquid
  9. 9. BuoyancyBuoyancy If the objects density is less than 1 g/cm3 , it floats in water If an objects density is greater than 1 g/cm3 , it sinks in water Another way to look at it…
  10. 10. BuoyancyBuoyancy All this applies to other liquids And gasses too!!
  11. 11. Force of Gravity Buoyan t Force of Air
  12. 12. Bob’s homemade buoyancy control device still needed some minor tweaks.

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