Find the pressure exerted by a 1500 N crate with an area of 6 square meters.
Remember: pressure = force / area
Units: pascals
250 pascals
100
Why couldn't we blow the paper wad into the 2 liter soda bottle?
Blowing into the bottle creates pressure which prevents the paper wad from entering the bottle.
100
Density is the amout of __________ an object has in a given space.
matter
100
True/False: Water is about 1000 times more dense than air.
True
100
Describe the relationship between water pressure and depth.
The deeper you go, the greater the pressure.
200
Find the pressure exerted by a 5000 N crate with an area of 10 square meters.
Remember: pressure = force / area
Units: pascals
500 pascals
200
Why did the most water come out of the lowest hole cut into the juice container?
Pressure increases with depth and since there was more pressure on the bottom hole, more water came out.
200
Bernoulli's principle states as the speed of a fluid increases, its __________ decreases.
pressure
200
True/False: Birds with bigger wings have more lift?
True
200
Does Archimedes Principle deal with bouyant force or fluid pressure?
It has to do with bouyant force.
300
What is the density of a 900 cubic centimeter block with a mass of 500 grams?
Remember: denisty = mass / volume
Units: grams per cubic centimeters
0.55 grams per cubic centimeters
300
Why did the dropper (diver) sink when we squeezed the plastic bottle?
When we squeeze the bottle, pressure causes more water to enter in the dropper, increasing its density, and causing it to sink.
300
The force that opposes motion in a fluid is __________.
drag
300
True/False: Atmospheric pressure is greater in space than at sea level.
False
300
Does Pascal's Principle give lift to our paper airplanes?
No, Pascal's Principle has to do with the transmission of fluid pressure.
400
A 1092 gram fish displaces 420 cubic centimeters of water. What is the density of the fish?
Remember: density = mass / volume
Units: grams per cubic centimeters
2.6 grams per cubic centimeters
400
Why does a helium balloon float in the air.
A helium ballon floats because helium is less dense than the air outside the ballon.
400
The forward force produced by a plane's engine is the __________.
thrust
400
Can changing the shape of an object help make it float?
Yes it can. Think of our demonstration.
400
How does a submarine ascend and descend in the water.
A submarine ascends and descends by changing the average density of the ship. It does this by filling and emptying large tank of seawater.
500
An object weighs 60 grams. It displaces a volume of water that 25 cubic centimeters. Will the object sink or float?
Remember: density = mass / volume
Remember: Water = 1.0 gram per cubic centimeter
The object has a density of 2.4 grams per cubic centimeters. Therefore, the object will sink.
500
Why were the two pieces of paper drawn together when we blew between them?
The speed of the air between the two paper creates a low pressure area causing the two pieces of paper to come together. (Bernoulli's Principle)
500
__________ is the irregular flow of a fluid.
Turbulence
500
Do all heavy objects sink in water?
No, it depends on the density of the object.
500
How does Bernoulli's Principle give lift to our paper airplanes?
The speed of the air moving over the tops of the wings creates low pressure which causes lift.