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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Presentation transcript:

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

Calculating Density 2.9 g/cm 3 A piece of metal has a mass of 43.5 g and a volume of 15 cm 3. What is its density? Practice Problem

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?

1.5 g/ml

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

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

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

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

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.

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

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

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

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.

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!

End of Section: Floating and Sinking