01. Essential Physics Revision Flashcards
How does an internal combustion engine burn fuel
INTERNALLY WITH AIR
Pg 18
Piston Engine
How does a piston engine turn the propeller.
Heats ____ to increase ____ within a ____
- Heats Air
- Increase Pressure
- Cylinder
Pg 19
Jet Engine
How is thrust produced
HIGH SPEED EXHAUST
Pg 19
Piston and Gas Turbine engines produce thrust by ____ a mass of ____ backwards
- Accelerating
- Air
Pg 20
What is the equation for the elements
Acceleration
Mass
Force
M F A
Mass = Force / Acceleration
Force = Mass x Acceleration
REMEMBER: EnFORCE M F A
Pg 20
What 2 things is thrust dependant on when being produced
Think M F A where Thrust is the Force
- Mass of air
- Acceleration mass of air imparts
Pg 20
As an aircrafts forward speed increases, what must happen to the mass of air creating thrust
GIVEN GREATER ACCELERATION
As an aircrafts forward speed increases, a given mass of air must be given a greater acceleration to produce the same level of thrust
Pg 20
What is the formula determine the increase of acceleration required in flight if forward speed increases
Force = Mass x Acceleration
WHERE
Force = Mass x (Vjet - Vflight)
WHERE;
Vjet = Speed of air exiting gas turbine
Vflight = Speed of air (forward airspeed)
Pg 20
What is Vjet
Speed of air exiting gas turbine
F = M - (Vjet - Vflight)
Pg 20
What is Vflight
Speed of air
(forward air speed)
F = M - (Vjet - Vflight)
Pg 20
What is the equation for POWER
Power = Energy / Time
P E T
Pg 21
What is the SI unit for POWER
WATTS
Pg 21
What is the SI unit for ENERGY
JOULES
Pg 21
In the Power = Energy / Time equation, thinking of the SI units, what does the equation equate to
i.e. how many watts per what
1 watt is 1 joule per 1 second
Pg 21
What is the equation for WORK DONE
Force = Energy / Distance
Pg 21
GENERAL NOTE
When considering the equation Power = Energy / Time and the equation for work down, which is Energy = Force x Distance, if you factor in the time element for work down by dividing each side of the equation, you will get Energy/Time = (force x distance) / Time.
We already know Energy / Time = power. We know that Distance / Time is speed in the S D T triangle. Therefore, the equation;
Energy/Time = Force x (Distance / Time) becomes…
Power = Force x Speed
Pg 21
1 Horsepower = ? w
740 watts
Pg 22
What is the definition of Torque
Tendancy for a force to rotate an object around an axis
Pg 23
The amount of torque depends on what 3 quantities
- FORCE applied
- LENGTH of lever arm
- ANGLE;
between lever arm connecting the axis to the point where force is applied
Pg 24
What is the SI unit of TORQUE
NEWTON METRE
Pg 24
What is the Imperial unit of TORQUE
FOOT / Lb
Pg 24
Piston engines combust ____ to generate ____ to turn a ____
- GAS
- PRESSURE
- PROPELLER
Summary
Gas turbine engines combust ____ to turn a ____ and ____ gas FORWARD or REWARDS at HIGH or LOW speed
- GAS
- FAN
- EXHAUST
- REWARDS
- HIGH
Summary
Which force move the aircraft through the air
THRUST
Summary
Engine power produced is measured in which 2 units
- WATTS
- KILOWATTS
Summary
