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Grade 8 Fluids Review
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Why is buoyancy good for oil spills?
Oil is more buoyant than water, so the oil sits at the top of water. It's easier to clean it up.
Which system can be used to lift heavier loads - pneumatic or hydraulic?
Hydraulic
Draw diagrams related to particle theory to explain one of the following concepts: compressability, density, temperature/viscosity, temperature/volume
...
What factors affect flow rate through a tube?
Tube diameter, the amount of force (pressure) pushing the fluid through, viscosity, the adhesion/cohesion of the fluid, the material of the tube..
What does this label have to do with fluids?
Pressure, temperature, volume, explode
What do varicose veins have to do with valves?
It's a condition where the valves in veins don't work properly. The valves don't close enough, so they don't stop blood from dropping down and accumulating)
The lower the viscosity of a liquid, the slower the flow rate. T/F?
F
What is atmospheric pressure? Is it acting on you now?
The pressure from the air in the atmosphere. Yes! In all directions.
How would you use displacement to measure the volume of an object?
Put it in water and see how much the water rises. Or, put it ina completely full container and measure how much liquid spills out. 
Plunger A has an area of 10cm^2, and Plunger B has an area of 50cm^2. How much more force can be exerted by Plunger B?
5 times
Two objects have the same mass, but different density. What can you say about their volume?
The more dense object will have a smaller volume.
What would happen if you teleported to the bottom of the Mariana trench with just a high-tech oxygen tank?
You would be crushed by water pressure.
Explain the difference between hydraulic and pneumatic systems.
...
1Pa = 1N / m^2. What does this formula say, and what does "Pa" represent?
Pressure equals Force in Newtons divided by Area in meters squared. Pa = Pascals
Which will float better - an object which displaces 10kg of water, or an object which displaces 50kg of water? Both have the same mass.
50kg - more displacement, better floatation.
Which has greater buoyancy - salt or fresh water?
Salt water (more dense)
What is buoyancy?
The upward force a fluid exerts on an object.
Water has a special property to do with density and temperature. What is it?
Water gets LESS dense when it becomes a solid (because its particles form crystals which have more space in between)
Density = mass / volume. What does this formula tell us?
...
What does a blood thinner do to the viscosity of blood? How does this affect blood pressure?
Decreases viscosity, decreases blood pressure
In a tube, is flow faster in the center or at the edges? Why?
The center (because of adhesion)
Adhesion is...
the force of attraction between particles of a fluid and particles of other substances
Cohesion is....
the strength of attraction between particles of a fluid
What kind of flow does this diagram represent? Draw a diagram to show the other kind.
Turbulent
Name 5 fluids
...
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