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Physics > General Revisoin > Flashcards

General Revisoin Flashcards

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1
Q

On speed time graphs what do flat sections mean

A

Stationary

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2
Q

On speed time graphs what do ups / downs mean

A

Constant speed

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3
Q

Examples of renewable recourses

A

Wind, solar, geothermal, hydropower

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4
Q

Advantages of renewable energy

A

Reduces greenhouse gasses
Stable energy prices
Environmentally friendly

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5
Q

Disadvantages of renewable energy

A

Lots of space
Many emit emisiones
Initial cost is high

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6
Q

E samples of non renewable energy

A

Oil
Natural gases
Coal
Nuclear energy

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7
Q

Advantages of non renewable energy

A

Affordable
High in energy

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8
Q

Disadvantages of non renewable energy

A

Pollute environment
Unreliable

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9
Q

What are the 8 energy stores

A

Kinetic
Thermal
Nuclear
Gravitational potential
Electrostatic
Magnetic
Chemical
Elastic potential

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10
Q

What are the Energy transfers

A

Heating
Work done by forces
Work done by electricity

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11
Q

Efficiency equation

A

Efficiency = useful energy in / useful energy out

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12
Q

GPE equation

A

GPE = m x g x h

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13
Q

Kinetic energy equation

A

1/2 x m x v2

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14
Q

Acceleration equation

A

Acceleration = change in velocity / time

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15
Q

Scalar def

A

Only have magnitude

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16
Q

Vector def

A

Has both magnitude and direction

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17
Q

Scalar examples

A

Mass, volume, time, speed, density, energy

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18
Q

Vector exsamples

A

Velocity
Force
Current
Gravity
Momentum
Weight
Acceleration
Displacment

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19
Q

Stopping distance equation

A

Stopping distance = thinking distance + breaking distance

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20
Q

Things that affect thinking distance

A

Drugs
Alcohol
Visibility
Tiredness
Speed
Distractions

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21
Q

Things that affect breaking distance

A

Mass
Wet road
Worn tires
Icy road
Breaks

22
Q

Momentum equation

A

Momentum = mass x velocity

23
Q

Conservation of mass equation

A

Total mass before = total mass after

24
Q

Rate of change of momentum equation

A

Rate of change of momentum = change in momentum / time

25
Q

Recoil def

A

Momentum is conserved when 2 objects explode apart
Momentum in first object must be the same in the second

26
Q

Recoil velocity equation

A

Recoil velocity = mass x speed

27
Q

Transverse waves def

A

Particles in a wave oscillate at right angles in the direction the wave travels
Eg
Electro magnetic, water waves

28
Q

Longitudinal wave def

A

Particles in a wave oscillate parallel to the wave direction
Eg
Sound waves, p waves

29
Q

Frequency def

A

Number of oscillations per second

30
Q

Amplitude def

A

Maximum displacement from a point of oscillation

31
Q

Wavelength def

A

Distance between two matching points on naighbouring wave

32
Q

What is frequency measured in

A

Hertz Hz

33
Q

Amplitude measurements

A

Decibels

34
Q

Wavelength measurements

A

Meters k

35
Q

Does a dense material have a small or large wavelength

A

Small

36
Q

Does the refraction bend towards the normal?

A

Yes

37
Q

)(
What is this kind of lense called?

A

Concave

38
Q

()
What is this kind of lense called?

A

Convex

39
Q

Properties of concave (diverging) lenses

A

Virtual
Upright
Diminished

40
Q

Properties of convex (converging) lenses

A

Real
Magnified
Inverted

41
Q

Power of lense equation

A

Power of lense = 1 / focal length

42
Q

Symptoms of radiation (8)

A

Hair loss
Teeth falling out
Cancer
Vomiting
Death
Fever
Fatigue
Mutation

43
Q

4 types of radiation

A

Alpha
Beta -
Gamma
Positron

44
Q

Half life definition

A

Time it takes the number of radioactive nuclei in a sample to decrease by half

45
Q

Example of half life

A

Carbón 14 has a half life of 5730 years
It takes 5730 years for carbon - 14 to decrease by half

46
Q

Facts about beta decay particles (4)

A

Atomic mass stays the same
Atomic number = +1
Weakly ionising
Stopped by aluminium

47
Q

Alpha decay properties (4)

A

Atomic mass = -4
Atomic number = -2
Stoped by paper
Can’t pass skin

48
Q

Positron decay properties (4)

A

Atomic mass stays the same
Atomic number = -1
+1 electron
Type of antimatter

49
Q

Gamma ray properties (5)

A

Atomic mass stays the same
Atomic number stays the same
Part of electromagnetic spectrum
Stopped by thick lead
Travels at speed of light

50
Q

What is energy measured in

A

J

51
Q

What are forces measured in?

A

N

Physics (6 decks)

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