Basic Physics Flashcards
Define matter
Any substance that occupies space and has mass
Matter may exist in what three states
Solid liquid gas
What is meant by pressure
Force that acts on a unit of area
Define kinetic energy
Kinetic energy is energy in motion
Work is the product of what two factors
Force in the distance moved
What are the parts of a lever
A rigid bar, and a pivot point called a fulcrum
A wheelbarrow is an example of what class of lever
Second class lever
What is meant by the fulcrum of a lever
The point about which the lever rotates
A seesaw is an example of what class of lever
A first class lever
What is meant by the density of air
The weight of a given volume of air
What characteristic of the atmosphere determines the speed of sound?
Temperature
Are liquid compressible
No liquids are not considered compressible
Are all three states of matter affected by thermal expansion, and if so, which state is affected most
All three states of matter are affected with gases being affected the most
What is a British thermal unit?
The amount of heat energy required to change the temperature of 1 pound of water, 1°F
Name the three methods of heat transfer
Conduction, convection, and radiation
What time to find the temperature at which all molecule motion ceases?
Absolute zero
What is meant by the term absolute zero
The temperature at which all molecular motion ceases
What are the customary units used to express hydraulic or pneumatic pressure in the United Stats
PSI, pounds per square inch
Describe how pressure is transmitted when a force is applied to a confined fluid
Pressure is transmitted equally in all directions
What formula expresses the relationship between force pressure and area
Force equals area times pressure
What is the approximate speed of sound at sea level on a standard day?
661 knots or 750 mph
What is the atmospheric pressure at? Sea level on a standard day?
29.92 inches of mercury
What is the temperature on a standard day at sea level
59°F or 15°C
What are the factors that determine density altitude?
Temperature in atmospheric pressure
What is the term used to describe the ratio between the amount of moisture actually presented in the atmosphere as compared to the amount the air could hold if it were completely saturated
Relative humidity
What are the four principal forces acting on an airplane in flight?
Lift, drag, thrust, and gravity
What is the term that describes the angle between relative win and the cord line of an airfoil?
Angle of attack
What are the factors that cause an airplane wing to stall?
Stall is caused when the angle of attack exceeds a critical value, and the air flow separate from the upper surface and becomes turbulent
What are the principal effects that result from lowering the flaps in flight
Lift increases, drag increases, stall speeds decrease
What is the function of a wing mounted Vortx generator?
Vortx generators delay or keep the airflow from separating from the upper surface of the wing during high-speed flight
How does blade flapping help to compensate for dissymmetry of lift and a helicopter main rotor system?
Blade flapping serve to increase the angle of a tact and lift on the retreating blade side of the rotor, and decreases the angle of attack and lift on the advancing blade side
How does the airflow through the main rotor of a helicopter change during the transition from normal flight to auto rotation?
During normal flight, the air moves downward, and during auto rotation, the air moves upward
What is friction?
The opposition to relative motion between two objects in contact with each other
