2 Physics

Question 1

1. Define matter.

Answer 1

Any substance that occupies space and has mass.

Question 2

2. Matter may exist in what 3 states?

Answer 2

Solid, liquid, gas

Question 3

3. Define kinetic energy.

Answer 3

Kinetic energy is the energy of motion.

Question 4

4. Work is the product of what 2 factors?

Answer 4

Force and the distance moved.

Question 5

5. What are the parts of a lever?

Answer 5

A rigid bar and a pivot point called the fulcrum.

Question 6

6. A wheelbarrow is an example of what class of lever?

Answer 6

2nd class lever

Question 7

7. Are all 3 states of matter affected by thermal expansion and if so, which state is affected most?

Answer 7

All 3 states are affected, gases the most.

Question 8

What is a BTU?

Answer 8

The amount of heat energy required to change the temp of 1 pound of water 1 degree F.

Question 9

9. Name the 3 methods of heat transfer.

Answer 9

Conduction, convection, and radiation.

Question 10

10. What term defines the temp at which all molecular motion ceases?

Answer 10

Absolute zero.

Question 11

11. Can liquids be compressed?

Answer 11

No, liquids are generally considered incompressible.

Question 12

12. What are the customary units used to express hydraulic or pneumatic pressure in the US?

Answer 12

PSI

Question 13

13. Describe how pressure is transmitted when a force is applied to a confined liquid.

Answer 13

Pressure is transmitted equally in all directions.

Question 14

14. What formula expresses the relationship between force, pressure, and area?

Answer 14

Force = area × pressure.

Question 15

What is the approx speed of sound at sea level on a standard day?

Answer 15

661kts or 340m/s

Question 16

16. What is the atmospheric pressure at sea level on a standard day?

Answer 16

29.92 in of Mercury or 1013.2 millibars.

Question 17

17. On a standard day at sea level, what is the value for temp?

Answer 17

59 F or 15 C.

Question 18

18. What are the factors that determine density altitude?

Answer 18

Temp and atmospheric pressure.

Question 19

19. What is the term used to describe the ratio between the amount of moisture actually present in the atmosphere as compared to the amount the air could hold if it were completely saturated?

Answer 19

Relative humidity.

Question 20

20. What are the 4 principle forces acting on an airplane in flight?

Answer 20

Lift, drag, thrust, and gravity.

Question 21

21. What is the term that describes the angle between the relative wind and the chord line of an airfoil?

Answer 21

Angle of attack.

Question 22

22. What are the factors that cause an airplane wing to stall?

Answer 22

Stall is caused when the angle of attack exceeds a critical value and the airflow separates from the upper surface and becomes turbulent.

Question 23

23. What are the principle effects that result from lowering the flaps while in flight?

Answer 23

Lift increases, drag increases, and stall speed decreases.

Question 24

24. What is the function of a wing mounted vortex generator?

Answer 24

Vortex generators delay or keep the airflow from separating from the upper surface of a wing during high speed flight.

Question 25

25. How does blade flapping help to compensate for dissymmetry of lift in helicopter main rotor systems?

Answer 25

Flapping increases the angle of attack and lift on the retreating blade and decreases the AoA and lift on the advancing blade.

Question 26

26. How does the airflow through the main rotor of a helicopter change during the transition from normal flight to autorotation?

Answer 26

During normal flight, the air moves downward, and during autorotation, the air moves upward.

Question 27

27. What is friction?

Answer 27

The opposition to relative motion between 2 objects in contact with each other.