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Homework exercises on Forces in Fluids for a Physical Science course. Also refer to Physics, liquids, hydraulics, density, pressure, buoyancy, education, distance learning, Ron Kurtus, School for Champions. Copyright © Restrictions
Forces in Fluids - Homework Answers
After you have completed the Forces in Fluids Homework, you can refer to these answers. Although it is better to have known the answer from your reading, the process of writing the correct answer on your homework sheet will help you remember the concepts.
Density
1. What is the definition of density?
Density is defined as the mass or amount of material divided by its volume.
2. What is the density of water in the metric system?
1 gram per cubic centimeter
3. Is lead denser on the Earth or on the Moon? Why or why not?
The weight is different, but the density is same because the mass does not change.
Pressure
4. What is the equation for Pressure?
.Pressure = force per unit area (P = F/A)
5. Why can spike high heel shoes cause damage to a floor?
The pressure at the small heel is very great..
Fluid pressure and gravity
6. What causes water pressure at the bottom of a lake?
The weight of the water above (per unit area).
7. How is pressure related to depth of a liquid?
It is proportional to the depth..
8. Which direction has the greatest pressure in water? Up or down?
Water pressure at a given depth is the same in all directions.
9. What causes high pressure in the weather?
.The column of air is higher and thus weighs more..
10. Why could a sealed bag of snacks bought in Milwaukee and brought to Denver explode?
The air pressure is less in higher elevations, so the internal pressure of the bag could cause it to burst.
Buoyancy
11. Why do bubbles of air get bigger as they float to the surface?
.The water pressure is less as the bubbles get higher, so their internal air pressure causes them to expand.
12. Why does a helium balloon want to go up?
Helium is lighter than air, so it wants to float, similar to a piece of wood going to the top of water.
13. How did Archimedes determine if the statue was pure gold?
He compared the amount of water displaced with that of pure gold of the same weight.
Bernoulli's Principle
14. What happens to air pressure in a tube when the air speed increases?
Air pressure goes down as air speed increases
15. What causes the lift on an airplane wing?
Air pressure is less on the top of the wing, because the shape causes the air to move faster across the surface. This results in lift.
Where can you go from here?