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Caa Physcis B1 > Physics > Flashcards

Physics Flashcards

1
Q

Define static

A

When a body is at rest or all the forces are in equilibrium it is static

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2
Q

Define centre of gravity

A

Centre of gravity is the balance point of an aircraft or object

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3
Q

What is the equation for moments

A

Moment is force x distance

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4
Q

For an aicraft to return to equilibrium what moments have to be equal

A

The clockwise and anti clockwise moments

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5
Q

Scalar quantiles have only got

A

A magnitude

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6
Q

Vector quantities have

A

A magnitude and direction

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7
Q

What is the formula for stress

A

Stress is force divided by area

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8
Q

What is the unit of stress

A

N/m squared

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9
Q

What is the equation for strain

A

Strain is is the change in length divided by the original

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10
Q

What is the equation for elasticity

A

stress divide by the strain

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11
Q

What is hookes law hint (springs )

A

is the spring constant times the exstention

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12
Q

What parts does the stress strain curve have

A

Proportional limit
Elastic limit
Lower yeild point
Breaking point
Fracture point

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13
Q

The density equation is

A

Mass divide by volume Kgm cubed

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14
Q

What is the pressure equation

A

Force divide by area

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15
Q

What is pascals principle

A

It says that when force is applied to an enclosed fluid they transmit all pressure to the walls of the container equally

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16
Q

What is absolute pressure

A

Gauge pressure plus the ambient pressure usually 15

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17
Q

What is the effect of depth

A

It gets greater the further you go down due to atmospheric pressure and the water above you

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18
Q

How to calculate load

A

Pressure x area

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19
Q

What is Archimedes principle

A

It is the law of bouyncy the volume of displaced fluid is equivalent the volume of the object immersed

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20
Q

What is relative density

A

Weight of solid divide by the upthrust

Upthrust cna be calculated by the weight of the object in the air - the weight of the object in water

21
Q

What is atmospheric pressure

A

It is effectively the column of air sitting above you stretching to the atmosphere it is about 101.3kn m cubed

22
Q

How to claulate the height of a mecurcy Colum

A

It is pressure divide by density x gravity

23
Q

How to calculate speed

A

Speed is distance traveled divide by time taken

24
Q

Acceleration

A

Change of velocity divide by time

25
Q

Is velocity a vector true or false

A

True

26
Q

What is the equation of linear motion

A

The initial velocity plus change of velocity x time or v=u+at

27
Q

What is Newton’s first law

A

An object at rest tends to remain at rest and an object in motion tends to remain in motion

28
Q

What is Newton’s second law

A

When a force acts upon a body the momentum of the body is changed the rate of change is proportional to the applied force

29
Q

What is Newton’s third law

A

Every action has an equal and oposite reaction

30
Q

What is the equation for momentum

A

Mass x velocity

31
Q

How to calculate angular displacement

A

Arc length divide by radius of the circle

32
Q

How to calculate angular velocity hint (rads )

A

The angular displacement (rads) divide by time

33
Q

Centripetal force acts towards the scentre true or false

A

True

34
Q

Centrifugal force acts outwards true or false

A

True

35
Q

What is periodic motion

A

It is a motion that repeats itself after an equal period of time

They at and sup of the amplitude the height of the wave

The time period peak to peak
And the displacement the lowest peak to the biggest

36
Q

What is resonance

A

It is the natural frequency of an object if two frequency math they’ll resonate an increase their amplitude

37
Q

How to calculate mechanical advantage

A

Force x distance

load / effort

38
Q

What is a first class lever

A

It’s like a sea saw

39
Q

What is a second class lever

A

It’s where is on the handle and you balancing it on the fulcrum

Effort load fulcrum

40
Q

What is a third class lever

A

It’s where your hands in the middle closest to the fulcrum with the weight on the other side

Load effort fulcrum

41
Q

How to calculate the mechanical advantage of a screw

A

Circumference divide by pitch

42
Q

What is the velocity ratio

A

It is the distance moved by effort divide by the distance moved by load
Or
Teeth on driven divide by teeth on drive

43
Q

What is weight

A

Mass x gravity

44
Q

What is the equation of boyles law

A

P1 x v1

45
Q

What is the Doppler shift equation

A

Reciver frequency - transmitter

46
Q

What is the atomic mass

A

Protons and neutrons

47
Q

What do the atomic number

A

Protons

48
Q

What is acceleration

A

V2 -V1
————
T

Caa Physcis B1 (3 decks)

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