Formulas

Question 1

force

Answer 1

mass x acceleration

Question 2

weight

Answer 2

mass x gravity

Question 3

velocity / speed

Answer 3

distance/time

Question 4

acceleration

Answer 4

change in velocity/change in time

Question 5

density

Answer 5

mass/volume

Question 6

P1V1

Answer 6

P2V2

Question 7

relationship between volume and pressure

Answer 7

inversely proportional

Question 8

Pressure (in terms of volume)

Answer 8

P ∝ 1/v

Question 9

power (in terms of work)

Answer 9

work done/time taken

Question 10

power (in terms of energy)

Answer 10

change in energy/time taken

Question 11

pressure

Answer 11

force/area

Question 12

pressure in liquids

Answer 12

density x gravity x depth

Question 13

current

Answer 13

charge/time

Question 14

potential difference

Answer 14

work done/charge

Question 15

what is ohm’s law?

Answer 15

voltage = current x resistance

Question 16

resistance

Answer 16

voltage/current

Question 17

power (in terms of current)

Answer 17

current x voltage

Question 18

energy (in terms of voltage)

Answer 18

voltage x current x time

Question 19

heat energy

Answer 19

mass x specific heat capacity x temperature change

Question 20

efficiency

Answer 20

(useful energy output/energy input) x 100

Question 21

wave speed

Answer 21

frequency x wavelength

Question 22

frequency

Answer 22

number of oscillations/time taken

Question 23

frequency (in terms of T, time for 1 oscillation)

Answer 23

1/T

Question 24

refractive index (using sine)

Answer 24

sin i/sinr

Question 25

refractive index (in terms of wave speed)

Answer 25

v1/v2

Question 26

refractive index (in terms of critical angle)

Answer 26

1/sin c

Question 27

mega is

Answer 27

x one million

Question 28

kilo is

Answer 28

x one thousand

Question 29

milli is

Answer 29

divide by one thousand

Question 30

unit for force/weight

Answer 30

N

Question 31

unit for temperature

Answer 31

degrees C or K

Question 32

unit for velocity/speed

Answer 32

m/s
km/h

Question 33

unit for current

Answer 33

Amps (A)

Question 34

unit for charge

Answer 34

Coulombs (C)

Question 35

unit for power

Answer 35

watts (W)

Question 36

unit for pressure

Answer 36

Pascals (Pa)
N/cm squared

Question 37

unit for electrical energy

Answer 37

kWh (kilowatt hour)

Question 38

unit for mass

Answer 38

g
kg

Question 39

unit for frequency

Answer 39

Hertz (Hz)

Question 40

unit for acceleration

Answer 40

m/s squared

Question 41

unit for p.d (voltage)

Answer 41

Volts (V)

Question 42

unit for resistance

Answer 42

Ohms (omega symbol)

Question 43

unit for density

Answer 43

g/cm cubed
kg/m cubed

Question 44

unit for work + all energy types

Answer 44

Joules (J)

Question 45

unit for specific heat capacity

Answer 45

J/kg C
J/g C

Question 46

converting between kelvin and celsius

Answer 46

T (in K) = T (in ºC) + 273

Question 47

pressure

Answer 47

P= F/A
Pressure (Pa) = Force (N) / Area (m2)

Question 48

change in pressure (beneath surface of liquid)

Answer 48

Δp=ρgΔh
Change in pressure = density x gravitational force x change in height/depth

Question 49

boyle’s law

Answer 49

P1V1=P2V2 ONLY WHEN TEMPERATURE IS CONSTANT

Question 50

unit for pressure

Answer 50

Pascal (Pa)

Question 51

constant (pressure)

Answer 51

pV = constant

Question 52

change in energy

Answer 52

Energy(J)= mass (kg) x Specific Heat Capacity (J/kg°C) x Change in Temperature (°C)

Question 53

specific heat capacity

Answer 53

c = ΔE / mΔt

Question 54

density

Answer 54

p = m/v
density = mass / volume

Question 55

period of a pendulum

Answer 55

time/ swings

Question 56

acceleration

Answer 56

change in velocity / time

Question 57

wieght

Answer 57

mass x g

Question 58

force

Answer 58

mass x acceleration

Question 59

hooke’s law: force

Answer 59

constant x extension

Question 60

pressure

Answer 60

force / area

Question 61

fluid pressure

Answer 61

density x gravity x height

Question 62

work

Answer 62

force x distance

Question 63

power

Answer 63

work / time

Question 64

kinetic energy

Answer 64

mass x velocity ^2 / 2

Question 65

gpe

Answer 65

mass x gravity x height

Question 66

power efficiency

Answer 66

useful power output / total energy input x 100

Question 67

energy efficiency

Answer 67

useful energy output / total energy input x 100

Question 68

moment

Answer 68

force x perpendicular distance from pivot

Question 69

momentum

Answer 69

mass x velocity

Question 70

force

Answer 70

change in momentum / time

Question 71

impulse

Answer 71

change in momentum

Question 72

centripetal force

Answer 72

mass x velocityˆ2 / radius

Question 73

boyles law

Answer 73

p1v1 = p2v2 OR pressure x volume = constant

Question 74

energy

Answer 74

mass x shc x temp change

Question 75

thermal capacity

Answer 75

mass = shc

Question 76

energy transferred

Answer 76

mass x specific latent heat

Question 77

current

Answer 77

charge / time

Question 78

voltage

Answer 78

energy transferred / charge

Question 79

charge

Answer 79

current x time

Question 80

voltage

Answer 80

current x resistance

Question 81

power

Answer 81

current x voltage

Question 82

power

Answer 82

currentˆ2 x resistance

Question 83

energy

Answer 83

current x voltage x time

Question 84

energy

Answer 84

power x time

Question 85

resistance in series

Answer 85

R1 + R2 + R3 ….

Question 86

resistance in parallel

Answer 86

1/Rtotal = 1/R1 + 1/R2 + 1/R3 ….

Question 87

wave speed

Answer 87

frequency x wavelength

Question 88

frequency

Answer 88

1/period

Question 89

refractive index

Answer 89

sin i / sin r

Question 90

refractive index (material)

Answer 90

speed of light in vacuum / speed of light in material

Question 91

refractive index (critical angle)

Answer 91

1 / sin c

Question 92

tranformer

Answer 92