Physics Test

Physics is sometimes called the science of _______ and ___________

Matter and energy

__________ is the foundation of any discussion of physics

Matter

________ is the force acting mutually between particles of matter

Attraction

A device called a _________ is used for measuring specific gravity of _________

Hydrometer, liquids

Stored energy and energy at rest is defined as

Potential energy

Energy that is in motion is defined as

Kinetic energy

If a _______ is applied the tendency will be for the object to move

Force

Two factors involved with measurable work are ______ and __________

Force, movement

The force of friction for objects mounted on wheels or rollers is called

Rolling friction

The concept of power involves work but adds the consideration of ________

Time

Torque is described as a ______ acting along the _____________

Force, distance

A machine is a device with which ________ may be accomplished

Work

A _______ moveable pulley has the mechanical advantage of 2

Single

The gear with the ______ _________ is called the drive gear

Input force

Stress is measured in _________________ or ____________________

Pounds per square inch or foot

Tension is a force that tries to

Pull an object apart

When an object becomes distorted by an applied force the object is said to be

Strained

_______ is a form of energy

Heat

Heat energy is expressed in ________ or ________

Calories or British thermal units

An aircraft air cooled piston engine is a good example of __________ being used to transfer heat

Convection

A gauge that includes atmospheric pressure is called

PSIA

The pivot point is called the ________ of a lever

Fulcrum

A deflecting beam torque wrench measures strain by using a __________

Pressure gauge

3 methods of heat transfer are

Conduction, convection, radiation

Pure water boils...

100 Celsius, 373 kelvin, 212 F, 672 rankine

Pure water freezes...

0 c, 273k, 32 F, 429 R

Molecular motion ceases at absolute zero

273 C, 460F

3 examples of potential energy

Energy in a battery, rubber band stretched between 2 fingers, water sitting behind a dam

What must be known to calculate density of a substance

Weight, volume

What two factors are involved in calculating power?

Force, distance, time

Explain what an absolute pressure gauge measures

Includes atmospheric pressure in its reading

Mach number

Ratio of aircraft speed to the speed of sound

What determines the amount of water vapor that can be present in the air?

Absolute humidity

4 forces of flight

Lift, weight, thrust, drag

What happens to pressure and velocity in a converging duct with subsonic airflow

Decrease pressure, increase velocity

List the exes on of an aircraft

Longitudinal, vertical, lateral

How is control obtained about the longitudinal axis

The ailerons

Describe relative wind as it pertains to an aircraft in flight

The direction of movement of the atmosphere relative to an aircraft or an aircraft foil

What forces must be equal for a helicopter to hover

Weight and drag

Auto rotation

A power off maneuver in which the engine is disengaged from the main rotor disk and the rotor blades are driven by the upward flow of air through the rotor

Solution to blade dissymmetry of lift

Reducing the angle of attack of the advancing blade and increasing the angle of attack of the retreating blade

Work =

Force x Distance

Power =

Force x distance /time

Converting foot pounds per minuet to horse power

Divide by 33,000

Torque=

Force times distance

Mechanical advantage =

Force out/ force in or distance out/distance in

Effort=

Effort (E) x effor arm (L)= resistance (R) x Resistance arm (I)

If the temperature of a confined liquid is held constant and its pressure is tripled , the volume will be ?

The same

The speed of sound in the atmosphere is most affected by variants in which of the following?

Ambient temperatures

Under which conditions will the rate of flow of a liquid through a metering office ( jet) be the greatest ( all other factors being equal)

Unmetered 17th I, metered 5psi, atmospheric 14.7 psi

The boiling point of a liquid varies

Inversely with pressure

How much work input is required to lower a 120 pound weight from the top of a 3 foot table

360 ft-lbs (120 x 3)

An airplane wing is designed to produce lift resulting from

Positive air pressure below the wings surface and negative air pressure above the wings surface along with the downward deflection of air

A wing with a very high aspect ratio will have

A low stall speed

The purpose of aircraft wing dihedral is to

Increase lateral stability

If all, or a significant part of a stall strip is missing on an airplane wing, a likely result will be

Asymmetrical lateral control at or near stall angles of attack

What statement concerning heat/temp is true

Temp is a measure of kinetic energy of the molecules of any substance

In physics which of the following factors are necessary to determine power?

Force exerted, distance moved, time required

Aspect ratio of a wing is defined as the ratio of

Wingspan to the mean chord

Risk associated with use of related units of measure

Make sure you use the right units/ read right units because it could cause major damage

_______ may be defined as time rate of doing work

Power

When using gas law formulas you must first convert the values to

Absolute temperature and pressure

converting to F

F=(c x 1.8) +32

Converting to C

(F-32)/1.8

Converting to R

F+ 460

Converting to K

C +273

Force =

Pressure x area

At point 2 , the velocity _______ and the pressure _________

Increases, decreases

Explain how density altitude changes aircraft and engine performance

The less dense the air, the less lift, takes more power to climb, and longer distance needed for takeoff and landing. The less dense air reduces propeller efficiency and reduced thrust. Dense air results in the opposite of less dense air.

What kind of effects can a repair have on a flight surface?

Structural weakness, changes in aerodynamics, new stresses

Pina pressure formula

P1(v1)/T1= p2(v2)/t2

Heat expansion formula

E=KL(t2-t1)

If the volume of a confined gas is doubles the pressure will

Reduced to one half its original value

If both volume and the absolute temperature of a confined gas are doubles, the pressure will

Not change

Which statement concerning Bernoulli's principle is true?

The pressure of a fluid decreases at points where the velocity of the fluid increases

Newton's first law of motion

Objects at rest tend to remain at rest until acted upon by a force

Which condition is the actual amount of water vapor in a mixture of air and water

Absolute humidity

Which will weigh the least?

35 parts dry air 65 parts water vapor

Which is the ratio of the water vapor actually present in the atmosphere of to the amount that would be present if the air were saturated at the prevailing temperature and not pressure

Relative humidity

The speed of sound in the atmosphere

Changes with a change in temperature

The speed of sound in the atmosphere is most affected by variations in which of the following?

Ambient temperature

Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?

High temperature with high humidity

Absolute humidity

Actual amount of water vapor in a mixture of air and water

The temperature to which humid air must be cooled at constant pressure to become saturated is called

Dew point

Main rotor system in aircraft is classified in 3 groups, which is not one?

Flexible beam rotor system

If all, or a significant part of a stall strip is missing on an airplane wing, a likely result will be

Asymmetrical lateral control at or near stall angles

The purpose of stall strips on airplane wings is to

Ensure that wing route areas stall first

Aspect ratio of a wing is defined as the ratio of the

Wingspan to the mean chord

The desired effect of using winglets on an aircraft's wingtips is to

Increase the lift to drag ratio