Questions of 9.2

Questions of 9.2
1. What is a hydraulic?
2. What is a hydraulic system?
3. Give some examples of hydraulic system.
4. What is a pneumatic?
5. What is a pneumatic system?
6. Give some examples of pneumatic system.
7. What happened if the hydraulic and pneumatic system loose pressure?
8. List an example on when will people use hydraulic system.
9. What is a fluid system?
10. List a thing that is always used to put the liquid under pressure.




Answers of 9.2

1. The study of how liquids act when they are under pressure.
2. A device that uses pressure to apply a force through a liquid to move something else.
3. Tank, pipe, toothpaste, hose, water pipe.
4. The study of how gases act when they are under pressure.
5. A device that uses pressure to apply a force through a gas to move something else.
6. Filled tires, drill teeth, air brakes, vacuum cleaner.
7. They can not work or may not function well.
8. To turn on a hose or a water tap.
9. Something that makes use of a gas or a liquid to perform tasks.
10. pumps

Questions of 9.1

Questions of 9.1
1. The pressure of air sea level is called __________.
2. The tendency for objects to rise or float in a fluid is called _________.
3. What caused Buoyancy to occur?
4. If the _______ force is greater than the force of _______ the object will rise.
5. For water, air, and all other fluids, pressure ______ with ______.
6. Is the air pressure on the mountain greater or at the base? Why?
7. Which of the following has less dense, cooler air or heated air?
8. Why does pressure in a fluid increase with depth?
9. What will happen if the buoyant force is equal to the force of gravity?
10. Give an example when the buoyant force is greater than the gravity.

Answer key
1. One atmosphere
2. buoyancy
3. Because of differences in density
4. buoyant, gravity
5. increase, depth
6. At the base, because air pressure increase with depth.
7. Heated air
8. There is a lot more water pushing down on the water at the bottom.
9. The object will float.
10. Helium balloon