A Look at Density and Buoyancy

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Presentation transcript:

A Look at Density and Buoyancy Name:

What are density and buoyancy? Density is the amount of mass in a given volume of a substance. Buoyancy is the tendency of an object to float in a fluid that is more dense than the object is.

What are the physical characteristics of these bears?

How can you explain the tilt of the scale?

What are the physical characteristics of these objects?

Place the objects on the scale to indicate that the green object is more dense than the red one. What could the two objects be made of? Red: Green:

What are the physical characteristics of these two liquids?

What more can you tell about the physical properties?

If the blue liquid is water, what could the green liquid be? *

Did you know... Objects that are more dense than water will sink. Objects that are less dense than water will float.

This item is less dense than water. What makes it less dense? *

Is this item more or less dense than water? How do you know? *

Which air is more dense in a 2-story house…the air upstairs or the air downstairs? Explain. *

Sink or Float?

The sinking beach ball A beach ball will normally float on water, as shown in the swimming pool. Demonstrate and explain how a beach ball could sink.

The floating egg An egg will normally sink in water. Demonstrate and explain what you could do to make an egg float.