Physics

Question 1

Define matter.

Answer 1

Any substance that occupies space and has mass.

Question 2

Matter may exist in what three states?

Answer 2

Solid.
Liquid.
Gas.

Question 3

Define kinetic energy:

Answer 3

The energy of motion.

Question 4

Work is the product of what two factors?

Answer 4

Force.
Distance moved.

Question 5

What are the parts of a lever?

Answer 5

A rigid bar.
A pivot point called the fulcrum.

Question 6

A wheelbarrow is an example of what class of lever?

Answer 6

A second class lever.

Question 7

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

Answer 7

All three states are affected, with gases being affected most.

Question 8

What is a British thermal unit?
(BTU)

Answer 8

The amount of heat energy required to change the temperature of 1 pound of water 1°F. 

Question 9

Name the three methods of heat transfer:

Answer 9

Convection
Conduction.
Radiation.

Question 10

What term defines the temperature at which all molecular motion ceases?

Answer 10

Absolute zero.

Question 11

Can liquids be compressed?

Answer 11

No, liquids are generally considered incompressible. 

Question 12

What are the customary units used to express hydraulic or pneumatic pressure in the United States?

Answer 12

Pounds per square inch (psi)

Question 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

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

Answer 14

Force equals area times pressure.

Question 15

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

Answer 15

761 mph
661 knots
or 340 m/s

Question 16

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

Answer 16

29.92 inches of mercury or 1013.2 mbar.

Question 17

On a standard day at sea level, what is the value for temperature?

Answer 17

59°F or 15°C

Question 18

What are the factors that determine density altitude?

Answer 18

Temperature.
Atmospheric pressure.

Question 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

What are the four principal forces acting on an airplane in flight?

Answer 20

Lift.
Gravity.
Thrust.
Drag.

Question 21

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

Answer 21

Angle of attack.

Question 22

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

Answer 22

When the angle of attack exceeds a critical value and separates from the upper surface and becomes turbulent.

Question 23

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

Answer 23

Lift increases.
Drag increases.
Stall speed decreases.

Question 24

What is the function of a wing mounted vortex generator?

Answer 24

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

Question 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 angle of attack and lift on the advancing blade.

Question 26

How does the air flow through the main rotor of a helicopter change during the transition from normal flight to auto rotation?

Answer 26

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

Question 27

What is friction?

Answer 27

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