01. Essential Physics Revision

Question 1

How does an internal combustion engine burn fuel

Answer 1

INTERNALLY WITH AIR

Pg 18

Question 2

Piston Engine

How does a piston engine turn the propeller.
Heats ____ to increase ____ within a ____

Answer 2

1. Heats Air
2. Increase Pressure
3. Cylinder

Pg 19

Question 3

Jet Engine

How is thrust produced

Answer 3

HIGH SPEED EXHAUST

Pg 19

Question 4

Piston and Gas Turbine engines produce thrust by ____ a mass of ____ backwards

Answer 4

1. Accelerating
2. Air

Pg 20

Question 5

What is the equation for the elements
Acceleration
Mass
Force

Answer 5

M F A
Mass = Force / Acceleration

Force = Mass x Acceleration

REMEMBER: EnFORCE M F A

Pg 20

Question 6

What 2 things is thrust dependant on when being produced

Think M F A where Thrust is the Force

Answer 6

1. Mass of air
2. Acceleration mass of air imparts

Pg 20

Question 7

As an aircrafts forward speed increases, what must happen to the mass of air creating thrust

Answer 7

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

Question 8

What is the formula determine the increase of acceleration required in flight if forward speed increases

Answer 8

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

Question 9

What is Vjet

Answer 9

Speed of air exiting gas turbine

F = M - (Vjet - Vflight)

Pg 20

Question 10

What is Vflight

Answer 10

Speed of air
(forward air speed)

F = M - (Vjet - Vflight)

Pg 20

Question 11

What is the equation for POWER

Answer 11

Power = Energy / Time
P E T

Pg 21

Question 12

What is the SI unit for POWER

Answer 12

WATTS

Pg 21

Question 13

What is the SI unit for ENERGY

Answer 13

JOULES

Pg 21

Question 14

In the Power = Energy / Time equation, thinking of the SI units, what does the equation equate to

i.e. how many watts per what

Answer 14

1 watt is 1 joule per 1 second

Pg 21

Question 15

What is the equation for WORK DONE

Answer 15

Force = Energy / Distance

Pg 21

Question 16

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…

Answer 16

Power = Force x Speed

Pg 21

Question 17

1 Horsepower = ? w

Answer 17

740 watts

Pg 22

Question 18

What is the definition of Torque

Answer 18

Tendancy for a force to rotate an object around an axis

Pg 23

Question 19

The amount of torque depends on what 3 quantities

Answer 19

1. FORCE applied
2. LENGTH of lever arm
3. ANGLE;
   between lever arm connecting the axis to the point where force is applied

Pg 24

Question 20

What is the SI unit of TORQUE

Answer 20

NEWTON METRE

Pg 24

Question 21

What is the Imperial unit of TORQUE

Answer 21

FOOT / Lb

Pg 24

Question 22

Piston engines combust ____ to generate ____ to turn a ____

Answer 22

1. GAS
2. PRESSURE
3. PROPELLER

Summary

Question 23

Gas turbine engines combust ____ to turn a ____ and ____ gas FORWARD or REWARDS at HIGH or LOW speed

Answer 23

1. GAS
2. FAN
3. EXHAUST
4. REWARDS
5. HIGH

Summary

Question 24

Which force move the aircraft through the air

Answer 24

THRUST

Summary

Question 25

Engine power produced is measured in which 2 units

Answer 25

1. WATTS
2. KILOWATTS

Summary