1. List three objects that you think would sink in water, and three objects you think would float.
Sink: An egg, a penny, and a rock.
Float: A ping pong ball, an air-filled balloon, a boat
2. Why do you think some things float and some things sink?
Some things float and some things sink because...
Student Exploration: Density
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Vocabulary: density, mass, matter, volume
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. List three objects that you think would sink in water, and three objects you think would float.
Sink: An egg, a penny, and a rock.
Float: A ping pong ball, an air-filled balloon, a boat
2. Why do you think some things float and some things sink?
Some things float and some things sink because it all depends on how much matter is
inside the object that you’re using.
Gizmo Warm-up
1. In the Gizmo, drag the apple onto the Scale. The scale measures mass. Mass is the
amount of matter, or “stuff,” in an object.
What is the apple’s mass? (Note: “g” stands for grams.) 33g
2. An object’s volume is the amount of space it takes up. The volume of an object can be measured by using
a graduated cylinder. Observe the graduated cylinder and the blue text showing the volume of water
inside the cylinder.
A. What is the starting volume of water in the graduated 400mL
cylinder?
B. Place the apple into the cylinder. What is the volume in 444mL
the cylinder now?
The water rises in the cylinder because it is displaced, or pushed upward, by the apple. The amount of
displaced water is equal to the volume of the apple.
C. What is the volume of the apple? (Use the Object 44cm3
volume to check.)
Note: Milliliters (mL) are used for liquid volumes, while cubic centimeters (cm3) are used for solids. One mL is
the same volume as one cm3. The apple’s volume is measured in cm3.
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