Density
Pressure
Buoyant force
Sinking and Floating Objects
Archimedes' Principle
100
How can you calculate the density of an object?
Density=Mass/Volume
100
True or false: Pressure is exerted on an object in all directions.
True
100
What direction does buoyant force act in?
upward
100
If an object has a density of less than 1 g/cubic cm, that object will ____________in water.
float
100
Archimedes discovered that submerging an irregularly shaped object in water allows you to find the _________of that object.
volume
200
True or false: The density of 1gram of gold is less than the density of 100 grams of gold.
False, density stays the same throughout the substance if not altered.
200
In a fluid, as depth increases, pressure____________.
Increases
200
What is buoyant force?
The upward force that acts on an object place in a fluid
200
How does a fish sink when it wants to and float when it wants to?
It fills or releases the air in its swim bladder
200
What can you do to a chunk of metal to allow it to float in water?
You can increase the volume which decreases the average density of the boat which makes it less dense than water
300
What is the volume of an object with a density of 15g/cm3 and a mass of 5g?
3 cubic cm
300
Both liquids and gases are fluids because they can__________.
Flow
300
If buoyant force is less than the weight of the object, the object will ______ in the fluid.
sink
300
See photo 6: The weight of fluid displaced in this photo will be ________ the weight of the object.
What is less than?
300
According to Archimedes, what is the weight of the fluid displaced by an object equal to?
The buoyant force acting on the object
400
A tube of water if filled with 60ml. An object is placed inside the tube and the tube measurement rises to 82ml. What is the volume of the object?
22mL
400
_________ __________ is a result of pressure in a fluid acting on an object
Buoyant force
400
An object weighs 70 N in the air and 35 N submerged in water. What is the buoyant force exerted on the object?
35 N
400
Why do hot air balloons float?
What is warm air is less dense than cold air, making its uoyant force greater than gravitational force
400
When Archimede's placed the King's crown in water, it displaced MORE water than a chunk of pure gold of the same weight did. What did this tell him about the crown?
It told him that the crown took up more volume than pure gold, meaning some silver was mixed in.
500
A piece of wood that measures 3 cm by 6 cm by 4 cm has a mass of 80 grams. Determine it's density. Then determine if this would would float in water. (Density of water =1g/cm3
1.1 g/cm3; No, it would not float on water
500
Why is there less pressure at higher elevations?
There are less air molecules pushing down on an object
500
The reason why buoyant force does not increase with increasing depths.
What is buoyant force is due to the difference between the top and bottom of objects and that does not change?
500
A fluid with a density of 5.6g/cm3 has two objects inside of it. Object A has a density of 7.6g/cm3, Object B had a density of 4.6g/cm3. Determine what will happen to objects A and B.
A will sink and B will float.
500
Two objects are submerged in water. They have the same volume and different densities. Is their buoyant force the same or different?
The buoyant force would be the same because equal volumes displace the same volume of water.
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