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Year 11 second half > physics > Flashcards

physics Flashcards

1
Q

Do you always need units in physics answers

A

yes

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2
Q

weight:

A

Force of gravity

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3
Q

what is an advantage of an oil power station

A

It is more reliable, not dependent on weather

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4
Q

weight equation

A

w=mg

Weight = mass x gravity

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5
Q

pressure equation

A 
P = F/A
Pressure = force/area
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6
Q

density equation

A

P = m/v

Density equals mass/volume

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7
Q

describe the movement of molecules in a solid

A

Molecules vibrate

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8
Q

describe the movement of molecules in a gas

A

Molecules move freely, randomly, high speed, zig zag

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9
Q

explain in terms of momentum how the molecules exert a pressure on the walls of the box

A

Molecules collide with walls
molecules change momentum
Force = change in momentum/time

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10
Q

what is meant by thermometer range

A

Difference between maximum and minimum temps it can measure

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11
Q

what is meant by thermometer sensitivity

A

Distance moved by liquid thread per degrees Celsius

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12
Q

how to calculate tension

A

Mass x gravity

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13
Q

mass equation

A

Mass = volume x density

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14
Q

the two types of waves

A

Transverse or longitudinal

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15
Q

what is a Transverse wave

A

a wave in which the medium vibrates at right angles to the direction of its propagation

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16
Q

what is a longitudinal wave

A

a wave vibrating in the direction of propagation

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17
Q

Image in a plane mirror

A

Same size
Upright
virtual image

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18
Q

What is refraction

A

When the waves go from one medium to another

eg. A ruler in a water tank

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19
Q

Acceleration equation

A

acceleration = velocity/time

A = vel/time

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20
Q

centripetal

A

Towards the surface

21
Q

3 types of acceleration

A

positive
negative
Centripetal

22
Q

what is refraction

A

The bending of light, sound, water and waves. As it passes from one transparent substance into another.

23
Q

What does refraction make possible

A

Lenses, magnifying glasses, prisms and rainbows.

without refraction, we wouldn’t be able to focus light on our retina

24
Q

critical angle abréviation

A

c

25
Q

Total internal reflection

A

More dense -> less dense

angle of incidence > critical angle

26
Q

what happens when white light enters a prism

A

It splits into a rainbow

27
Q

what is another name for a focal point

A

Principal focus

28
Q

the centre of the lens is called

A

optical centre `

29
Q

The line though the centre of the lens and perpendicular to the lens is called

A

The principal axis

30
Q

equation for the magnifications produced by the lens:

A

M = image height/object height

31
Q

When does light change direction?

A

when it enters a lens

32
Q

What temperature does ice melt at

A

0 degrees celsius

33
Q

What is Lf

A

specific latent heat of fusion

34
Q

What is Lv

A

Specific latent heat of vaporisation

35
Q

Equation for energy required to change substance property

A 
Energy = mass x latent heat 
H = m L
36
Q

What wave has the highest frequency out of these three: Ultraviolet, radio waves, infrared waves

A

Ultraviolet has a higher frequency than radio waves and infrared waves

37
Q

What wave has the longest wavelength out of these three: microwaves, xrays, gamma rays

A

Microwaves have a longer wavelength than X-rays and gamma rays

38
Q

What type of wave is used in satellite communication

A

Microwaves are used in satellite communication

39
Q

properties of electromagnetic waves:

A

Transverse waves
do not need a medium (can travel through a vacuum)
All electromagnetic waves travel with the same high speed of c=3.0x10 to the power of 8 in a vacuum and approximately the same speed in air

40
Q

As wavelength decreases, frequency must ____

A

increase

41
Q

The higher the frequency of an EM wave the greater its ______

A

energy

42
Q

Wave equation

A

Velocity = frequency x wavelength

43
Q

What type of wave is sound

A

longitudal

44
Q

is measuring the size of earthquakes a use of ultrasound

A

no

45
Q

Which seismic waves are transverse waves

A

S-waves

46
Q

Specific heat capacity

A

The amount of energy required to raise the temperature of 1kg of a substance by 1 degrees celsius

47
Q

How many joules are in a mega joule

A

1000000

1 million

48
Q

Change in thermal energy =

A

mass x specific heat capacity x temperature change

ΔE = mc ΔT

49
Q

Heat capacity for water, ice, steam, aluminium, iron, glass, copper, mercury, gold (J/kg)

A 
Water = 4186
Ice = 2090
Steam = 2010
Aluminium = 900
iron = 448
Glass = 837
Copper = 387
Mercury = 138
Gold = 129

Year 11 second half (42 decks)

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