The document compares two solid cubes made of the same material but different sizes - one is large and one is small. It asks which statement about the density of the cubes is true. The correct statement is that the density of the larger cube is the same as the density of the smaller cube, because density is a property of the material and does not change with the size of the object.

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. 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. BuoyancyBuoyancy
An upward force on an
object in water equal to
the weight of the water
the object pushes out of
the way

4. BuoyancyBuoyancy
Example:
Clay ball
It sinks in
water
Force of
Gravity
Buoyan
t Force

5. BuoyancyBuoyancy
If the buoyant force is less
than the objects weight
The object sinks
Negative buoyancy

6. BuoyancyBuoyancy
Flatten the
clay out
Shape it
like a boat
It floats
Force
of
Gravity
Buoyan
t Force

7. BuoyancyBuoyancy
If the buoyant force is
equal to the objects weight
The object floats
Positive buoyancy

8. BuoyancyBuoyancy
Neutral buoyancy?
An object seems to
be suspended in a
liquid

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. BuoyancyBuoyancy
All this applies to
other liquids
And gasses too!!

11. Force
of
Gravity
Buoyan
t Force
of Air

12. Bob’s
homemade
buoyancy
control device
still needed
some minor
tweaks.