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physics igcse > formulas and units > Flashcards

formulas and units Flashcards

1
Q

state hookes law

A

force= constant * extension
F=Kx

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2
Q

formula for moment

A

force * distance from pivot (at 90degrees)
F1d1 = F2d2
F1d1 + F2d2 = F3d3

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3
Q

pythagoras

A

aˆ2 = bˆ2+ cˆ2

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4
Q

force

A

mass x acceleration
mass=kg, a =m/s2

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5
Q

weight

A

mass * gravity
gravity= 9.8m/sˆ2

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6
Q

momentum

A

mass x velocity

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7
Q

impulse

A

= Force x contact time = change in momentum

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8
Q

velocity/speed

A

distance/time

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9
Q

acceleration

A

change in velocity / change in time

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10
Q

density

A

mass/volume

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11
Q

pressure laws in gas

A

1/volume
p1v1=p2v2

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12
Q

work

A

Force x distance (parallel to Force)

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13
Q

potential energy

A

mass x gravity x height

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14
Q

kinetic energy

A

= ½ x mass x (velocity)2

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15
Q

power. 4

A

work done/time taken
current * voltage
current ˆ2 * resistence
voltage ^2/ resistence

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16
Q

pressure

A

force/ area

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17
Q

pressure in liquids

A

= density x gravity x depth

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18
Q

current

A

charge/ time

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19
Q

potential difference (voltage)

A

work done/ charge

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20
Q

e.m.f

A

work done/ charge

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21
Q

ohms law

A

voltage= current * resistence

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22
Q

resistance

A

voltage/current

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23
Q

energy

A

voltage * current * time

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24
Q

resistence laws

A

bigger the length of wire, bigger the resistence
bigger the diameter of wire smaller the resistence

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25
Q

resistence in series

A

r= r1 +r2

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26
Q

resistence in parallel

A

r= r1 *r2/ r1+r2

27
Q

potential divider

A

v out= (r1/ r1 + r2) * v in
r1/r2= v1/v2

28
Q

heat energy

A

mass x specific heat capacity x temperature change

29
Q

efficiency

A

(useful Energy (or power) output/ Energy (or power) input) * 100%

30
Q

wave speed

A

frequency x wavelength

31
Q

frequency

A

number of oscillations/ time taken
1/T

32
Q

refractive index

A

sin 1/ sin r
v1/v2
1/sin c

33
Q

speed of light in a vacum

A

3 * 10ˆ8 m/s

34
Q

speed of sound in air

A

330 to 350 m/s

35
Q

human audible range

A

20-20000 hz

36
Q

transformers

A

number of turns in primary coil/ number of turns in secondary coil = voltage in primary coil/ voltage in secondary coil

voltage1 * current 1= voltage 2 * current2

37
Q

orbital speed

A

2 π r/ period time

38
Q

hubbles constant

A

speed/ distance

39
Q

age of universe

A

distance/ speed
1/hubbles constant

40
Q

hubbles constant number

A

2.2 x 10ˆ-18 per second

41
Q

one light year is…

A

9.5 x 1015 m

42
Q

milky way galaxy diameter

A

100 000 light years

43
Q

mega

A
  • 1000 000
44
Q

kilo

A
  • 1000
45
Q

mili

A

/1000

46
Q

unit for force and weight

A

newtons (N)

47
Q

mass unit

A

g or kg

48
Q

temperature unit

A

degrees or kelvin (k)

49
Q

frequency unit

A

hertz (hz)

50
Q

velocity speed unit

A

m/s or km/h

51
Q

acceleration unit

A

m/s ˆ2

52
Q

current

A

amps (A)

53
Q

p.d votlage unit

A

volts (V)

54
Q

charge unit

A

columbs (c)

55
Q

resistence unit

A

ohms (Ω)

56
Q

moments unit

A

Nm

57
Q

momentum unit

A

kg m/s

58
Q

power unit

A

watts (w)

59
Q

density unit

A

g/cm3
, kg/m3

60
Q

pressure units

A

Pascals (Pa), N/cm2

61
Q

work and energy unit

A

joules (J)

62
Q

electrical energy unit

A

kWh

63
Q

specific heat capacity

A

J/kg0C, J/g0C

physics igcse (7 decks)

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