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.Physics - Nilay > AS Physics 2020 > Flashcards

AS Physics 2020 Flashcards

1
Q

Define accuracy

A

How close a measurement is to the true value

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2
Q

Define precision

A

How close measurements are to each other.

How many significant figures it is measured to.

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3
Q

How to calculate uncertainty when adding or subtracting measurements?

A

Add the uncertainties of each value.

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4
Q

How to calculate uncertainty when multiplying or dividing measurements?

A

Add fractional uncertainties of values and multiply the sum of these uncertainties by the result.

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5
Q

How to calculate percentage uncertainty?

A

(uncertainty÷measured value)x100

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6
Q

How to calculate relative uncertainty?

A

uncertainty÷measured value

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7
Q

Give 4 examples of vector quantities

A

Velocity
Acceleration
Weight
Displacement

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8
Q

Give 4 examples of scalar quantities

A

Density
Speed
Distance
Volume

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9
Q

The gradient of a displacement-time graph gives the _________

A

velocity

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10
Q

The gradient of a velocity-time graph gives the _________

A

acceleration

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11
Q

The area under a velocity-time graph gives the _________

A

displacement

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12
Q

The gradient of a acceleration-time graph gives the _________

A

change in velocity

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13
Q

List the 4 suvat equations

A

v=u+at
s=(u+v)/2 x t
s=ut+½at²
v²=u²+2as

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14
Q

At terminal velocity, weight is equal to ______

A

air resistance.

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15
Q

Momentum formula

A

Momentum=massxvelocity

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16
Q

Conservation of linear momentum formula

A

m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

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17
Q

Elastic collision rule

A

Total Kinetic energy before collision = total kinetic energy after collision.

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18
Q

Inelastic collision rule

A

Total kinetic energy before collision > total kinetic energy after collision.

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19
Q

Newton’s 1st law

A

Object will remain stationary or in constant motion unless acted upon by another force.

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20
Q

Newton’s 2nd law

A

F=ma i.e net force applied is proportional to acceleration

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21
Q

Newton’s 3rd law

A

Every action has an equal and opposite reaction

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22
Q

Impulse formula

A

Δp = FΔt = mv - mu

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23
Q

Upthrust in fluid formula

A

upthrust = hρgA = ρgV

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24
Q

Torque or moment of force formula

A

τ = Fdsinθ

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25
Q

Conditions for equilibrium

A 
Στ = 0
ΣF = 0
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26
Q

Work done by a force formula

A

ΔW = Fs x cosθ

27
Q

Work done in stretching a spring formula

A

ΔW = ½kx²

28
Q

Electrical potential energy formula

A

V = W/q

29
Q

Power in terms of work done formula

A

P = W/t = Fv

30
Q

Electric field intensity formula

A

E = V/d

31
Q

Current in terms of charge formula

A

I = Q/t

32
Q

Ohm’s law formula

A

R = V/I

33
Q

Voltage in terms of charge formula

A

V = Energy/Q

34
Q

e.m.f formula

A

e.m.f = lost volts + terminal p.d.

35
Q

Resistivity formula

A

R = ρL/A

36
Q

Power definition

A

P = Energy/time

37
Q

When temperature of thermistor increases, resistance ________

A

decreases

38
Q

When Light around a LDR increases, resistance

A

decreases

39
Q

What are kirchoff’s laws

A 
ΣI = 0
ΣEMF = ΣIR
40
Q

Stress formula

A

σ = F/A

41
Q

Strain formula

A

ε = x/L

42
Q

Young modulus formula

A

E = σ/ε

43
Q

What is a wavelength

A

Distance between 2 crests or 2 toughs

44
Q

What is frequency of wave

A

Number of waves in 1 second

45
Q

What is time period of a wave

A

Time taken for 1 complete wave osscilation

46
Q

What is the speed of a wave

A

The distance moved by the wave in 1 second

47
Q

What is the amplitude of a wave

A

The maximum displacement of particles in a wave

48
Q

What are coherent waves

A

Two waves with the same frequency and constant phase difference

49
Q

Intensity of a wave formula

A

I∝a² (I is intensity, a is amplitude)

50
Q

What is constructive interference of waves

A

When the crests and troughs of 2 different waves overlap each other, amplitudes become added.

51
Q

What is destructive interference

A

When the crests of 1 wave overlap the troughs of another, the amplitudes cancel each other.

52
Q

What is the formula from the double slit experiment

A

x = (nλD)/d
x is distance of nth fringe from centre
n is the order of fringe counting from centre
d is the distance between slits
D is the distance between screen and slits

53
Q

What is the formula for diffraction gratings

A

nλ=dsinθ

54
Q

What is the strong force

A

Acts between nucleons and holds them together. Has a very short range.

55
Q

Those affected by the strong force are called ____

A

hadrons

56
Q

Those not affected by the strong force are called _____

A

leptons

57
Q

What is a fundamental particle

A

A particle that cannot be split into anything smaller e.g. electron

58
Q

What is the charge and strangeness of an Up quark

A

Charge: +⅔
Strangeness: 0

59
Q

What is the charge and strangeness of an Down quark

A

Charge: -⅓
Strangeness: 0

60
Q

What is the charge and strangeness of an Strange quark

A

Charge: -⅓
Strangeness: -1

61
Q

What are the 4 leptons

A

Electron
Positron
Electron neutrino
Electron antineutrino

62
Q

What are 2 hadrons

A

Protons

Neutrons

63
Q

Define mass of a body

A

property of the body resisting changes in motion

64
Q

Define force

A

rate of change of momentum

.Physics - Nilay (3 decks)

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