Aeroscience

Question 1

Scalar

Answer 1

• Magnitude

Question 2

Vector

Answer 2

Magnitude and direction

Question 3

Length

Answer 3

Metre (m)

Question 4

Mass

Answer 4

Kg

Question 5

Time

Answer 5

Seconds

Question 6

Temperature

Answer 6

• Celsius
• Kelvin

Question 7

Force

Answer 7

Newtons

Question 8

Pressure

Answer 8

Pascal

Question 9

Power

Answer 9

Watt

Question 10

Altitude

Answer 10

Feet
1ft =0.305 m

Question 11

Navigation distance

Answer 11

nautical miles

Question 12

Speed

Answer 12

Knots
- = 1 nm per hour

Question 13

Scalar quantity

Answer 13

• Only has magnitude
• E.g. temperature, time, mass, speed, length

Question 14

Vector quantity

Answer 14

• Both magnitude and direction
• E.g. weight

Question 15

Speed

Answer 15

• Distance traveled in unit time
• E.g. metres/second, kilometres/hour
• Nm/hour (in aviation)
• Scalar

Speed = distance traveled/time taken

Question 16

Velocity

Answer 16

• Vector equivalent of speed
• How fast and direction
• Distance traveled in a given direction in a given unit time
• Acceleration is whenever there is a change in velocity

Question 17

Newton’s First Law

Answer 17

An object will remain in its state of rest or uniform motion in a straight line unless acted upon by an external force.

Question 18

Newton’s Second Law

Answer 18

• The external factor acting on a body is proportional to its mass and the acceleration produced by the force
• F = ma

Question 19

Newton’s Third Law

Answer 19

For every action there is an equal and opposite reaction.

Question 20

Explain inertia

Answer 20

If there is no net force resulting from unbalanced forces acting on an object (if all the external forces cancel each other out), then the object maintains a constant velocity. If that velocity is zero, then the object remains at rest.

Question 21

Acceleration caused by Earth’s gravity

Answer 21

9.8 m/s-1

Question 22

Define momentum

Answer 22

• Momentum = mass x velocity
• Vector quantity
• The amount of motion an object possesses

Question 23

Centripetal force

Answer 23

Force pulling into the centre of rotation

Question 24

Centrifugal force

Answer 24

Force that acts equal and opposite to centripetal force, pulling away from the centre of rotation

Question 25

Factors that affect centripetal force and rate of turn.

Answer 25

- Mass of object - Velocity of object - Bank angle - Radius of turn

Question 26

Trig word to remember

Answer 26

SOHCAHTOA

Question 27

Name the three sides of a triangle

Answer 27

- Hypotenuse - Opposite - Adjacent

Question 28

Describe the moment of a force

Answer 28

- Moment = turning force about a pivot - The product of the perpendicular distance between its line of action and the pivot point and the force being applied

Question 29

Describe the moment of a couple

Answer 29

- Two parallel forces that are equal in magnitude and opposite in direction

Question 30

Conditions required for the translational and rotational equilibrium.

Answer 30

- Either at rest, or moving/rotating at the constant rate.

Question 31

Centre of gravity

Answer 31

- The point at which the weight of the aircraft is said to act through.

Question 32

Work

Answer 32

Work = force x distance

Question 33

Power

Answer 33

Work done over time taken

Question 34

Energy

Answer 34

- Capacity for doing work - Conserved quantity

Question 35

Kinetic energy

Answer 35

The energy something possesses by being in motion.

Question 36

Potential energy

Answer 36

Stored energy dependent on relative position.