Word Equations Flashcards

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1
Q

W = m g

A

Weight = mass x gravitational field strength

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2
Q

W = F s

A

Work done = force x distance

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3
Q

F = k e

A

Force applied to a spring = spring constant x entension

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4
Q

M = F d

A

Moment of a force = force x distance

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5
Q

P = F/A

A

Pressure = force normal to a surface / area of that surface

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6
Q

s = v t

A

Distance travelled = speed x time

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7
Q

a = △ v / t

A

Acceleration = change in velocity / time taken

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8
Q

F = m a

A

Resultant force = mass x acceleration

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9
Q

p = m v

A

Momentum = mass x velocity

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10
Q

E ₖ = 1/2 m v^2

A

Kinetic energy = 0.5 x mass x (speed)^2

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11
Q

E ₚ = m g h

A

Gravitational potential energy = mass x gravitational field strength x height

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12
Q

P = E / t

A

Power = energy transferred / time

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13
Q

P = W / t

A

Power = work done / time

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14
Q

Efficiency (1) = (energy transfer)

A

Efficiency = useful output energy transfer / total input energy transfer

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15
Q

Efficiency (2) = (power input)

A

Efficiency = useful power output / total power input

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16
Q

v = F λ

A

Wave speed = frequency x wavelength

17
Q

Q = I t

A

Charge flow = current x time

18
Q

V = I R

A

Potential difference = current x resistance

19
Q

P = V I

A

Power = potential difference x current

20
Q

P = I^2 R

A

Power = (current)^2 x resistance

21
Q

E = P t

A

Energy transferred = power x time

22
Q

E = Q V

A

Energy transferred = charge flow x potential difference

23
Q

P = m / V

A

Density = mass / volume

24
Q

p = h p g

A

Pressure due to a column of liquid = height of column x density of liquid x gravitational field strength (g)

25
Q

v^2 - u^2 = 2 a s

A

(Final velocity)^2 - (initial velocity)^2 = 2 x acceleration x distance

26
Q

F = m △ v / △ t

A

Force = change in momentum / time taken

27
Q

E ₑ = 1/2 k e^2

A

Elastic potential energy = 0.5 x spring constant x (extension)^2

28
Q

△ E = m c △ 0

A

Change in thermal energy = mass x specific heat capacity x temperature change

29
Q

Period = ?

A

Period = 1 / frequency

30
Q

Magnification = ?

A

Magnification = image height / object height

31
Q

F = B I l

A

Force on a conductor (at right angles to a magnetic field) carrying a current = magnetic flux density x current x length

32
Q

E = m L

A

Thermal energy for a change of state = mass x specific latent heat

33
Q

Vₚ / Vₛ = Nₚ / Nₛ

A

Potential difference across primary coil / Potential difference across secondary oil = Number of turns in primary coil / Number of turns in secondary coil

34
Q

Vₛ Iₛ = Vₚ Iₚ

A

Potential difference across primary coil x current in primary coil = Potential difference across secondary coil x Current in secondary coil

35
Q

p V = constant

A

(For gases) pressure x volume = constant