What principal addresses buoyant force? What does it state?
Archimedes's Principle - An object displaces a volume of fluid that's equal to the weight of the buoyant force.
100
Which principle addresses pressure in fluids?
Pascal's principle
100
Which principle addresses pressure and gases?
Bernoulli's principle
100
What's the formula for density?
Density = Mass / Volume
200
What's the formula for pressure?
Pressure = force / area
200
Why does pressure increase with depth?
Because density increases.
200
What is the unit for pressure?
Pascal (N / m2)
200
What does Bernoulli's principle state?
Moving air creates areas of less pressure.
200
What's the density of water?
Water's density is 1 g/mL
300
If you had to walk across a lake that had been frozen over and didn't want to apply too much pressure on the ice, what could you do?
Lay down on the ice to decrease the pressure (increase your area).
300
What affects the level at which a boat floats?
The weight (and density) of the boat
The density (buoyant force) of the liquid it's in
The shape of the ship (how much liquid it displaces
300
Why do your ears pop when you are in an airplane?
Your body is trying to balance the internal and external pressure.
300
What is lift?
The upward force that aids in flight.
300
Which is denser, water or air? Why?
Water is denser because the molecules are closer together. It also applies more pressure because it's more dense.
400
Where is water and atmospheric pressure the greatest and the least?
scuba diving
in a boat
top of Mt. Everest
1000 leagues under the sea
Least atmospheric pressure = top of Mt. Everest
Greatest atmospheric pressure = in a boat
Least water pressure = scuba diving
Greatest water pressure = 1000 leagues under the sea
400
If a 100N boat displaces a liquid that has a volume of 50 mL and a weight of 50 N, what is the buoyant force working on the boat?
Will it sink or float?
50 N; it will sink because the weight of the boat (100 N) is greater than the buoyant force (50N).
400
Describe how fluids flow.
Fluids flow from areas of high pressure to low pressure.
400
What's more dense - water or ice?
water
500
Why do astronauts use a space suit?
So their internal pressure doesn't overcome the (very small) external pressure.
500
Why does a cargo ship have a limit to what it can carry?
A cargo ship can only carry a limited amount of cargo because once the weight is greater than the buoyant force, the ship will sink.
500
Why doesn't a hydraulic system use gas instead of liquids?
Because gases can be compressed and liquids can not.
500
How does a straw work?
When you inhale, you're moving the air above the straw, created an area of less pressure. The greater pressure in the cup, which is pushing on the liquid, pushes the liquid up through the straw into your mouth.
500
If mercury (13.6 g/cm3) was put in water would it sink or float?