Physics equations

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28 Terms

1

density (kg/m³)

mass (kg) / volume (m³)

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2

change in thermal energy (J)

mass (kg) x specific heat capacity (J/kg°C) x change in temperature (°C)

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3

thermal energy for change in state (J)

mass (kg) x specific latent heat (J/kg)

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4

Boyle’s law

pressure (Pa) x volume (m³) = constant

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5

pressure due to a column of liquid (Pa)

height of column (m) x density of liquid (kg/m³) x gravitational field strength (N/kg)

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6

suvat

(final velocity (m/s))² - (initial velocity (m/s))² = 2 x acceleration (m/s²) x distance (m)

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7

distance (m)

speed (m/s) x time (s)

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8

acceleration (m/s²)

change in velocity (m/s) / time (s)

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9

kinetic energy (J)

½ x mass (kg) x (velocity (m/s))²

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10

force (N)

mass (kg) x acceleration (m/s²)

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11

momentum (kgm/s)

mass (kg) x velocity (m/s)

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12

work done (J)

force (N) x distance (m) → distance needs to be along the line of action of the force

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13

power (W)

energy (J) / time (s)

work done (J) / time (s)

current (A) x voltage (V)

(current (A))² x resistance (Ohms)

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14

energy transferred in stretching (J)

½ x spring constant (N/m) x (extension (m))²

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15

force exerted by a spring (N)

spring constant (N/m) x extension (m)

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16

weight (N)

mass (kg) x gravitational field strength (N/kg)

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17

gravitational potential energy (J)

mass (kg) x gravitational field strength (N/kg) x height (m)

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18

pressure (Pa)

force normal to the surface (N) / area of the surface (m²)

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19

moment (Nm)

force (N) x distance normal to the direction of the force (m)

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20

charge flow (C)

current (A) x time (s)

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21

potential difference (V)

current (A) x resistance (Ohms)

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22

electrical energy transferred (J)

charge (C) x potential difference (V)

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23

energy transferred (J, kWh)

power (W, kW) x time (s, h)

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24

force on a conductor (at right angles to a magnetic field) carrying a current (N)

magnetic field strength (T) x current (A) x length (m)

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25

transformers

v(primary) / v(secondary = n(primary) / n(secondary)

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26

wave speed (m/s)

frequency (Hz) x wavelength (m)

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27

efficiency

useful output energy transfer / total input energy transfer

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28

P8.2

v(primary) x I(primary) = v(secondary) x I(secondary)

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