2.2.1 Statics

Question 1

The pressure of still air is referred to as:

Answer 1

Static pressure

Question 2

The static pressure of the atmosphere surrounding an object of interest may also be called:

Answer 2

ambient pressure

Question 3

Force is a vector quantity, so it has both

Answer 3

Magnitude and direction

Question 4

The SI unit of force is the

Answer 4

Newton (N)

Question 5

Moment (Nm) =

Answer 5

Force (N) x Perpendicular distance (m)

Question 6

The turning effect of a force is called a

Answer 6

moment

Question 7

A ____ is a rigid bar capable of turning about a fixed axis called the _____

Answer 7

lever

fulcrum

Question 8

A ‘couple’ results from two equal forces acting in ____ but _____ directions on two different points of a body

Answer 8

parallel

opposite

Question 9

The effect that results from two or more vectors of the same type of quantity acting on an object is known as the _____

Two or more vectors that combine to give a resultant are its _____

Answer 9

resultant

components

Question 10

The centre of gravity (cg) of a body is the point about which it is _____ _____

Answer 10

perfectly balanced

Question 11

When a material has a force exerted on it, the material is said to be _______ or in a state of ____

Answer 11

stressed

stress

Question 12

Stress =

Answer 12

Force / C.S.A

Question 13

The SI unit of stress is :

Answer 13

N/m^2

Pascal (Pa)

Question 14

A bending force acts _____ to the length of an object

Answer 14

Perpendicularly

Question 15

When a rod or a wire is pulled, it stretches and the total stretch or elongation, expressed as a fraction of the un-stretched length is called ____

Answer 15

strain

Question 16

A solid is said to be _____ if it can readily be forced into a different shape ______ without fracturing eg paper clip

Answer 16

plastic

permanently

Question 17

The plasticity of most substances _____ with _____

Answer 17

increases

temperature

Question 18

A hard substance has a high _________ or any action tending to ____ its surface

Answer 18

resistance to indentation

penetrate

Question 19

The ability to resist breakage when deforming or impact forces are applied to it is called

Answer 19

toughness

Question 20

_______ materials can be beaten, rolled or pressed into shape without fracture

Answer 20

Malleable

Question 21

______ substances break with little or no change of shape

Most substances get more _____ as they get _____

Answer 21

brittle

brittle

colder

Question 22

A vapour is a gas that can be liquefied by an _____ in _____ without _____ its ______

Answer 22

increase

pressure

decreasing

temperature

Question 23

A volatile liquid is one which readily ….

Answer 23

evaporates (vaporises) at normal temperature

Question 24

The flash point of a combustible liquid is the …..

Answer 24

temperature it has to be before it will catch fire when exposed to a naked flame

Question 25

Aviation gasoline has a flashpoint of about

Answer 25

• 43^C

Question 26

All combustible liquids are very flammable when in the form of _____ or _____, regardless of flash point or temperature

Answer 26

mist

spray

Question 27

The pressure produced by a column of liquid is directly proportional to the ____ of the columnm and in no way it depends upon either the shape of the container or the amount of liquid the container holds

Answer 27

height

Question 28

The height of fluid above the level at which a pressure is taken is sometimes called a …..

Answer 28

‘head of pressure’

Question 29

Pressure =

Answer 29

Unit of force / unit of area

Question 30

Pressures measured as so much above a complete vacuum are said to be

Answer 30

absolute pressures

Question 31

When we are only interested in the difference between two pressures the difference is referred to as a

Answer 31

differential pressure

Question 32

The pressure of still air is referred to as

Answer 32

static pressure

Question 33

The static pressure of the atmoshphere surrounding an object of interest may also be called

Answer 33

ambient pressure

Question 34

Arhimedes principal states that when a body is immersed in a fluid, the apparent loss in weight equals ….

Answer 34

the weight of the fluid displaced

Question 35

Aneroid comes from the Greek and means ‘’-__ ____’’ ie there is no fluid in it

The aneroid barometer consists of ______ ____ ____ with _____ ____

Answer 35

not wet

closed sealed capsle

flexible sides

Question 36

When a barometer is used to measure height, it is called an

Answer 36

altimeter

Question 37

An altimeter is an instrument that is used to indicate the height of the aircraft above a predetermined level, such as _______ or _____

Answer 37

sea level

terrain beneath the aircraft

Question 38

Altimeters that measure the aircraft’s altitude by measuring the pressure of the atmospheric air are known as

Answer 38

pressure altimeters

Question 39

A barometer is an instrument for measuring _______

Answer 39

atmospheric pressure