VOCAB
Pronounce "Bouyancy".
FREE POINTS HAHA! (But I hope you got this right regardless)
Which has a lower density, ice or water? Why?
What is the equation for density?
Density = mass / volume
What unit of measurement can weight be measured in?
Grams
The mass of matter per unit volume.
Density
Which phase of matter has the greatest density? Why?
Solid. Atoms in a solid are very close together and this gives them a greater density.
Which phase of matter has the lowest density? Why?
What is a gas? Atoms in the gas are spread apart and have lots of space.
What is the difference between weight and mass?
Weight depends on the act of gravity on the mass. Mass is the same everywhere.
The downward force of gravity acting on mass.
Weight
What happens to the buoyant force on an object that is lowered into water?
The lower the object is pushed into the water, the stronger the buoyancy force gets.
Which has a greater weight, 1 gram of silver or 1 gram of gold?
They have the same weight.
How does the buoyant force of a rock submerged in water compare to the weight of the water displaced by the rock?
The amount of water displaced by the rock is equal to the buoyant force.
The measure of the upward force a fluid exerts on an object that is submerged.
Buoyancy
Why does ice float in water? Why? Use the words density and buoyancy to explain your answer.
Ice floats in water because ice is less dense than water. The buoyancy force is more than the weight of the object, so the ice floats.
What makes an object sink when it is put in water? What makes it float?
What property of an object determines the strength of buoyant force that will be exerted on it when submerged in water?
Weight
States that the buoyant force is equal to the weight of the fluid displaced by an object.
Archimedes' Principle
How do you find buoyancy force?
The buoyant force is equal to the amount of water displaced.
If steel is more dense than water, why is it possible for steel boats to float?
If a steel box is placed into water, it will sink because the density of steel is greater than the density of water. In order for a steel boat to float, it needs to be hollow. This will increase the volume and decrease the density.
A cargo barge weighs 200,000 N when empty. Cargo weighing 50,000 N is loaded onto the barge. What is the total weight of water displaced by the loaded barge?
30,000 N