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Aviation Physics Questions and
Answers Already Passed
What is matter? ✔✔Matter is what all things are made of. It's the foundation for any discussion of physics
What is the Law of Conservation? ✔✔Matter can not be created or destroyed but it is possible to change it's physical state
What's an example of the law of conservation? ✔✔the combustion process of liquid fuel or water from solid to liquid to vapor among others
How is mass mathematically stated? ✔✔Mass=Weight divided by Acceleration due to gravity
How is weight mathematically stated? ✔✔Weight=mass x gravity
What is the only way to change the mass of an object? ✔✔to add or take away atoms
What is weight? ✔✔a measure of the pull of gravity acting on the mass of an object
What are the six characteristics of matter? ✔✔Mass and weight
Attraction
Porosity
Impenetrability
Density
Specific Gravity
What is mass? ✔✔a measure of the quantity of matter in an object
What is density? ✔✔the weight of a substance per unit of volume
The density of a gas______ in direct proportion to the _____ exerted on it. ✔✔Increases pressure
What is the standard chosen by physicists when comparing the densities of all liquids and solids? ✔✔Water
What is most commonly used as the standard when comparing the densities gasses ✔✔Air
What is force? ✔✔The intensity of an impetus, or the intensity of an input
What is the unit for force is both english and metric systems? ✔✔English-pounds
Metric-newtons
In mechanical sense, when is work done? ✔✔When a resistance is overcome by a force acting through a measureable distance
What direction would it take more work to move an object? Horizontally or vertically? ✔✔Vertically
What are 3 kinds of friction? ✔✔Static Friction
Sliding Friction
Rolling Friction
When an attempt is made to slide a heavy object along a surface, the object must first be broken loose. What type of friction is this? ✔✔Static Friction
Is sliding friction always more or less than static friction ✔✔always less
With regards to sliding friction does the area of the the sliding surface exposed to the sliding surface have any effect on the results? ✔✔no, none
The concept of power involves work, which was a force being applied over a measured distance, but adds on one more consideration. What is that consideration? ✔✔time
What is the formula for work? ✔✔Work=Force x Distance
What is the formula for Power? ✔✔Power= Force x Distance divided by time
The units for power depend on how ________ and ______ are measured ✔✔Distance and time
How many ft/lbs are in one horse power? ✔✔550 ft/lbs
How many watts are in one horse power? ✔✔746 watts
What is mechanical advantage? ✔✔a comparison of the output force to the input force or the output distance to the input distance
what are the three basic parts of any lever? ✔✔Fulcrum
Force or effort
resistance
The combination of force and distance applied to a lever creates what force that tries to cause rotation? ✔✔Torque
Where is the fulcrum located in a first class lever? ✔✔between the effort and the resistance
What is the location of the fulcrum and the effort applied in a second class lever? ✔✔The fulcrum is at one end and the effort is applied at the other
What is the only advantage of the single fixed pulley? ✔✔to change the direction of the force, or pull on the rope
In a single moveable pulley, what will the weight being lifted always be in relation to the effort being applied? ✔✔One half
What determines the mechanical advantage of a block and tackle? ✔✔The number of weight supporting ropes
What are bevel gears used for? ✔✔to change the plane of rotation
What gear system has an extremely high mechanical advantage? ✔✔The worm gear
To determine the amount of gear reduction in a planetary sun gear system what would you do? ✔✔The number of teeth on the ring gear is divided by the number of teeth on the sun gear
Name 5 types of stresses found in mechanical bodies ✔✔Tension
compression
torsion
bending
shear
what is speed? ✔✔simply a rate of motion.
what is velocity ✔✔the rate of motion in a given direction
what is acceleration? ✔✔the increase in the rate of motion over a period of time
A vector quantity must have both ____ and ____ ✔✔magnitude and direction
What is centrifugal force? ✔✔the force that pulls a spinning object away from its center of rotation
what is centripetal force? ✔✔the equal and opposite force required to hold the weight in a circular path
What is BTU ✔✔The amount of heat required to change the temperature of 1lb of water
How much work is one BTU equivalent to? ✔✔778 ft/lbs of work
How much work is one calorie equivalent to? ✔✔equal to the amount of heat required to change the temperature of 1 gram of water 1 degree
What is heat? ✔✔a form of energy
What is the boiling point of pure water in degrees centigrade? ✔✔100 degrees C
What is Specific heat? ✔✔The ratio of the amount of heat energy needed to raise the temperature of an specific mass of material 1 degrees C, the the amount of heat energy needed to raise the temperature of the same mass of pure ware one degree C
What are the 3 method of heat transfer? ✔✔Conduction
Convection
Radiation
What are the four temperature scales? ✔✔Centigrade, Fahrenheit, Kelvin, and Rankine
What is the difference between fluid and gas? ✔✔when a force is applied to a liquid it tends to be incompressible and gases are highly compressible
A solid body submerged in a liquid or a gas weighs less than when weighed in free space. What is this called? ✔✔Buoyancy
What determines the pressure exerted at the bottom of a colum of a liquid? ✔✔by the height of the liquid and not by the container
What is Pascal's law? ✔✔concept of the pressure set up in a fluid and how it relates to the force acting on the fluid and the surface area through which it acts
What is Bernoulli's principle? ✔✔That for an inviscid flow of a nonconducting fluid, and increase in the speed of the fluid occurs with a decrease in pressure
What is sound? ✔✔a series of disturbances in matter that human ears can detect
What are three things necessary for the transmission and reception of sound? ✔✔Source, medium for carrying the sound, and the detector
What are the two basic physical properties which govern the velocity of sound? ✔✔Density and elastictiy
What unit is sound intensity measured in? ✔✔decibels
What determines the pitch of sound? ✔✔By the vibrations or the sounding source
What is the Mach Number? ✔✔The ratio of the speed of an aircraft to the speed of sound
What happens to the density of the atmosphere with an increase in alitude? ✔✔It would remain fairly constant
What is Doppler effect? ✔✔Apparent rise in the pitch or frequency of a sound as its source approached the hearer, and the decrease in pitch as the source moves away
