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6th Grade: Density & Buoyancy
Ms. Black @ Salk Density & Buoyancy
13
Science
6th Grade
06/12/2011

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Term
Buoyant Force
Definition
The upward force exerted by a fluid on a submerged object.
Term
Archimedes' principle
Definition
The rule that the buoyant force on an object is equal to the weight of the fluid displaced by that object.
Term
Density
Definition
The mass of a substance contained in a unit of volume. Mass/volume
Term
An object that is more dense than the fluid i which it is immersed will do this.
Definition
Sink
Term
If an object has a density that is equal to the density of the fluid in which it is immersed it will do this.
Definition
Float at a constant level
Term
The unit of measurement of density is
Definition
grams / cm cubed
Term
To calculate density you must know two things about the substance. What are they?
Definition
Its mass and its volume
Term
If an object floats to the surface of the fluid in which it is immersed it is...
Definition
...less dense than the fluid.
Term
Volume is measured in this unit
Definition
cm cubed
Term
Helium is less dense than air so a balloon does this.
Definition
Floats in air.
Term
Mass is measured in this unit.
Definition
grams
Term
True or False: Buoyancy Force acts with the force of gravity
Definition
True
Term
If you submerge an object what happens when the buoyancy force acts on it?
Definition
The object floats in the fluid
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