Formulas only Flashcards by Anna Sapoznik

Q

force

A

mass x acceleration

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Q

weight

A

mass x gravity

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Q

velocity / speed

A

distance/time

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Q

acceleration

A

change in velocity/change in time

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Q

density

A

mass/volume

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Q

P1V1

A

P2V2

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Q

relationship between volume and pressure

A

inversely proportional

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Q

Pressure (in terms of volume)

A

P ∝ 1/v

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Q

power (in terms of work)

A

work done/time taken

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Q

power (in terms of energy)

A

change in energy/time taken

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Q

pressure

A

force/area

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Q

pressure in liquids

A

density x gravity x depth

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Q

current

A

charge/time

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Q

potential difference

A

work done/charge

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Q

what is ohm’s law?

A

voltage = current x resistance

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Q

resistance

A

voltage/current

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Q

power (in terms of current)

A

current x voltage

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Q

energy (in terms of voltage)

A

voltage x current x time

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Q

heat energy

A

mass x specific heat capacity x temperature change

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Q

efficiency

A

(useful energy output/energy input) x 100

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Q

wave speed

A

frequency x wavelength

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Q

frequency

A

number of oscillations/time taken

Q

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

A

1/T

Q

refractive index (using sine)

A

sin i/sinr

refractive index (in terms of wave speed)

v1/v2

refractive index (in terms of critical angle)

1/sin c

mega is

x one million

kilo is

x one thousand

milli is

divide by one thousand

unit for force/weight

N

unit for temperature

degrees C or K

unit for velocity/speed

m/s km/h

unit for current

Amps (A)

unit for charge

Coulombs (C)

unit for power

watts (W)

unit for pressure

Pascals (Pa) N/cm squared

unit for electrical energy

kWh (kilowatt hour)

unit for mass

g kg

unit for frequency

Hertz (Hz)

unit for acceleration

m/s squared

unit for p.d (voltage)

Volts (V)

unit for resistance

Ohms (omega symbol)

unit for density

g/cm cubed kg/m cubed

unit for work + all energy types

Joules (J)

unit for specific heat capacity

J/kg C J/g C

converting between kelvin and celsius

T (in K) = T (in ºC) + 273

pressure

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

change in pressure (beneath surface of liquid)

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

boyle's law

P1V1=P2V2 ONLY WHEN TEMPERATURE IS CONSTANT

unit for pressure

Pascal (Pa)

constant (pressure)

pV = constant

change in energy

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

specific heat capacity

c = ΔE / mΔt

density

p = m/v density = mass / volume