Float or Sink
Wooden bead is more or less dense than water?
Less --> floats
What is a prediction?
A statement about a future event based off knowledge or experience.
If something has positive buoyancy, it _______.
Floats.
What device did we use to measure weight?
The spring scale
The amount of matter (number of molecules) in an object.
Aluminum cylinder (small) is more or less dense than water?
More --> sinks
What is volume?
The amount of space an object takes up.
If something has neutral buoyancy, it __________.
Neither floats nor sinks, but stays suspended in the fluid.
An object is 6 lb on Earth and 1 lb on the moon. What are we measuring?
Its weight.
What is the equation for density?
Mass divided by Volume
Acrylic cylinder (large) is more or less dense than water?
More --> sinks
What is density?
The amount of matter in a given volume;
Density = Mass/Volume
What is buoyant force?
The upward force exerted by a fluid on an object submerged in it.
An object is 10 kg on Earth and 10 kg on the moon. What is being measured?
Its mass.
Which is more dense:
the wooden bead
the glass marble
The glass marble.
Polyethylene cylinder (small) is more or less dense than water?
Less --> floats
What does calibrate mean?
To mark a gauge or instrument with a standard scale of readings.
Does size affect buoyancy if the material is the same?
The larger the size, the more buoyant an object is.
What were the heaviest objects in our 14 objects? What happened when we placed them in fresh water?
Ex. Clay (sank) Aluminum cylinder (sank)
Which is more dense:
a small object weighing 1 lb.
a large object weighing 1 lb.
The small object.
A submerged submarine is more or less dense than water?
The same density --> does not either float or sink
Define displacement.
Occupation by a submerged object or part of an object of a volume that would otherwise be occupied by a fluid.
Archimedes' Principle of Buoyancy.
If an object is denser than the fluid, it sinks.
If an object is less dense than the fluid, it floats.
If an object is the same density as the fluid, it neither sinks nor floats but remains suspended in the fluid.
Without changing the weight of the clay, how did you alter it to float? Explain why that worked.
Spreading out the weight over a larger volume reduced its density to less that of the fresh water.
With the aluminum foil, how could you alter its density to make it sink?
Crumple it into a small volume to increase its density.