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Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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Page 1: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Section 2:Floating and Sinking

How can you predict whether an object will float or sink in a fluid?What is the effect of the buoyant force?

Page 2: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Density

•Definition: The ratio of the mass of a substance to its volume.

Equation: Density = Mass Volume

Page 3: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Calculating Density

2.9 g/cm3

A piece of metal has a mass of 43.5 g and a volume of 15 cm3. What is its density?

•Practice Problem

Page 4: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Calculating Density

Math Solution: For example, a sample of liquid has a mass of 24 g and a volume of 16 mL. What is its density?

Page 5: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

•1.5 g/ml

Page 6: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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

Page 7: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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

Page 8: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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

Page 9: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Buoyancy

•Definition: The upward force exerted by a fluid on a submerged object.

Page 10: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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.

Page 11: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Buoyancy

•The buoyant force works opposite the weight of an object.

Page 12: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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

Page 13: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

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

Page 14: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Archimedes’ Principle•Definition: The rule that the buoyant force acting on a submerged object is equal to the weight of the volume of fluid displaced by the object.

Page 15: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

Gimme 5

• Draw the outline of your hand…..• Write one fact, definition, formula, etc…. On

each finger• Feel free to decorate with rings, paint nolish

(that’s how my daughter says nail polish), bracelets, etc… Have fun and make it colorful!

Page 16: Section 2: Floating and Sinking How can you predict whether an object will float or sink in a fluid? What is the effect of the buoyant force?

End of Section:Floating and Sinking


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