Ch.1 - Definitions

Question 1

SI units length

Answer 1

m

Question 2

SI units mass

Answer 2

Kg

Question 3

SI units time

Answer 3

s

Question 4

SI units temp

Answer 4

degress Celcius

Question 5

Derived units force

Answer 5

N

Question 6

Derived units pressure

Answer 6

Pa=Nm^2

Question 7

Derived units power

Answer 7

W

Question 8

1 horsepower = ___ W

Answer 8

746

Question 9

Non SI units altitude

Answer 9

ft

Question 10

1 ft = ____ m

Answer 10

0.3048

Question 11

Non SI units navigational distance

Answer 11

nm

Question 12

1 nm = ___ m

Answer 12

1,852

Question 13

Non SI units speed

Answer 13

kts

Question 14

1 kt = ___ ms^-1

Answer 14

0.514

Question 15

Acceleration

Answer 15

Change in velocity either speed or direction

Question 16

For an object to change direction ____ must be imposed

Answer 16

Centripetal force

Question 17

When speed alone changes there will be

Answer 17

Straight-line acceleration

Question 18

Mass

Answer 18

Amount of matter in an object

Question 19

Inertia

Answer 19

The tendency for an object to remain at rest or continue with present velocity (dependent on mass)

Question 20

Force

Answer 20

Tries to overcome inertia, =ma

Question 21

Weight

Answer 21

Force produced by mass being attracted to earth gravity, = mass x 9.81, vector as it has magnitude and direction

Question 22

Momentum

Answer 22

Difficulty stopping a moving object or changing its direction, = mv

Question 23

Moment

Answer 23

Turning force about a pivot (torque), = F x d

Question 24

Couple

Answer 24

2 equal but opposite forces that are parallel, moments and couples cause rotation about a pivot, if the forces can be made to change direction as the object turns the rotary motion can be made to continue

Question 25

Equilibrium

Answer 25

An object in a constant state of rest or velocity, sum of forces is zero

Question 26

Types of equilibrium

Answer 26

Transitional and rotational

Question 27

Transitional equilibrium

Answer 27

An object in rest, or moving in a straight line at a constant speed

Question 28

Rotational equilibrium

Answer 28

Rotating at a constant rate (rpm)

Question 29

How is a constant rpm maintained

Answer 29

Torque must be balanced by the torque in the opposite direction

Question 30

Newtons third law

Answer 30

Every action has an opposite and equal reaction

Question 31

Motion on a curved path

Answer 31

A force must be applied to the centre of the curve (centripetal force)

Question 32

Centripetal force

Answer 32

= m x v^2/r