1. Density and Buoyancy
Chapter 11.2
Page 424

2. How can you predict if an object will sink or float in a fluid?
You dive into a pool wearing a life vest. Wearing the vest makes you bigger and makes you weigh more. So why do you float?

3. Density and Buoyancy Chapter 11. 2
How can you predict whether an object will float or sink in a fluid?
What is the effect of the buoyant force?

4. Density
Density refers to the amount of matter that is contained in a certain amount of volume or space. It is better known as mass per unit volume.
It is determined by first finding the mass and the volume of an object.
Then, density is the mass of an object divided by its volume. Or:
Density = __Mass__
Volume

5. Density
Changes in density cause a submarine to dive, rise, or float.

6. Density
Changes in density cause a submarine to dive, rise, or float.

7. Density
Changes in density cause a submarine to dive, rise, or float.

8. Buoyancy Buoyancy is the ability to float.
A buoyant force acts on a submerged object in the opposite direction to the force of gravity.

9. Buoyancy
The pressure on the bottom of a submerged object is greater than the pressure on the top. The result is a net force in the upward direction.

10. Buoyancy
The buoyant force works opposite the weight of an object.

11. Buoyancy
Archimedes’ principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.

12. Buoyancy
A solid block of steel sinks in water. A steel ship with the same weight floats on the surface.

13. Click the Video button to watch a movie about density.

14. End of Section: Density and Buoyancy