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equations Flashcards

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1
Q

what is the equation for speed

A

speed = distance / time

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2
Q

equation for acceleration

A

acceleration (m/s^2) = change in velocity / time taken

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3
Q

equation for wieght

A

weight (N) = mass ( (k)grams ) x gravitational field strength (10 for earth)

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4
Q

equation linking resultant (unbalanced) force acceleration and mass

A

force = mass x accleration

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5
Q

equation for change in momentum

A

force acting (N) = change in momentum (kg m/s) / time taken for change to happen (s)

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6
Q

equation for momentum

A

momentum (kg m/s)= mass (kg) x velocity (m/s)

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7
Q

equation for moments

A

moment (Nm) = force (N) x distance from pivot (m)

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8
Q

orbital speed

A

orbital speed = ( 2 x pie x orbital radius) / time period

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9
Q

equation for power

A

power (P measured in Watts) = current (I measured in Amps) x voltage (V measured in Volts)

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10
Q

equation for energy transferred

A

energy transferred (E in Joules) = current (I in Amps) x Voltage ( V in Volts) x Time (t in s/ m/ h)

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11
Q

Linking current voltage and resistance

A

Voltage (V in Volts) = Current (I in Amps) x resistance (R in Ohms greek letter thingy)

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12
Q

what happens to current around a circuit

A

its the same everywhere

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13
Q

equation for charge

A

charge (Q in Coulombs (C) ) = current (I in Amps) x Time (t)

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14
Q

Tell me about voltage

A

Voltage is the energy transferred per unit of charge passed, One volt is one joule per coulomb, voltage decreased s you go around a circuit

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15
Q

equation linking time period and frequency

A

frequency (f in Hz) = 1 / time period (t in s)

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16
Q

equation linking frequency speed and wavelength

A

speed (m/s) = frequency (Hz) x wavelength (weird greek letter f thingy in metres)

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17
Q

snell’s law

A

refractive index (n with no unit) = sin I ( angle of incidence) / sin r (angle of refraction)

18
Q

Finding critical angles

A

sin C (critical angle -total internal reflection-) = 1 / n (refractive index)

19
Q

finding efficiency

A

efficiency = useful energy output / total energy input

20
Q

finding work done with force and distance

A

work done (W in Joules) = force ( F in Newtons) x distance moved (d in metres)

21
Q

finding Power with work done

A

Power ( P in Watts (or joules /s) = Work done (W in Joules) / time taken (s)

22
Q

finding kinetic energy

A

Kinetic energy ( KE in Joules) = 0.5 x mass x velocity squared

23
Q

finding Gravitational potential energy

A

Gravitational potential energy = mass x gravity x hieght

24
Q

link between GPE and KE

A

Kinetic Energy gained = gravitational potential energy lost

25
Q

finding density

A

density ( Weird greek p in Pa or N/m^2 = force (N) / Area ( m^2)

26
Q

finding pressure difference

A

pressure difference = height x density (Pa) x gravity

27
Q

link between pressure x volume

A

constant p1 x v1 =p2 x v2

28
Q

link between pressure and temperature in kelvin

A

pressure / temperature in kelvin = constant

p1 /T1 = p2/ T2

29
Q

linking input and output power

A

input power = output power VpIp = VsIs

30
Q

number of turns thingy

A

primary voltage/secondary voltage = primary turns/ secondary turns

or the reciprocal

31
Q

finding kinetic energy

A

Kinetic energy (KE in Joules) = 0.5 x mass (in grams) x velocity or speed squared (in m/s)

32
Q

finding gravitational potential energy

A

gravitational potential energy = mass x gravity x height

33
Q

link between GPE and KE

A

kinetic energy gained = gravitational potential energy lost

34
Q

how do you find density?

A

density (g/cm^3 or kg/m^3) = mass (g or kg) / volume(cm^3 or m^3)

35
Q

finding pressure

A

pressure (p in Pa or N/m^2)= force (F in Newtons / area (A in m^2)

36
Q

finding pressure difference

A

pressure difference = height x density x gravity

37
Q

pressure x volume = ?

A

a constant p1 x v1 = p2 x v2 pV = constant

38
Q

link between pressure/ temperature

A

a constant temperature in kelvin p1/T1 =p2/T2

39
Q

power is a constant

A

power in= power out Vp Ip =Vs Is

40
Q

number of turns equation thingy

A

voltage primary /voltage secondary = Number of turns primary / number of turns secondary

physics equations (1 decks)

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