Equations Flashcards
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a=∆/t (a=v-u/t)
acceleration (m/s^2) = change in velocity (m/s) ÷ time taken (s)
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E=1/2 mv^2
kinetic energy (J) = 1/2 x mass (kg) x speed squared (m/s)
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E=mgh
energy (J) = mass (kg) x gravitational field strength (N/kg) x change in height (m)
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E=VQ
energy (J) = potential difference (V) x charge (Q)
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F=1/t
frequency of an arc (Hz) = 1 ÷ time for one cycle (s)
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F=ke
force (N) = spring constant of a spring (N/m) x extension of a spring (m)
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F=ma
force (N) = mass (kg) x acceleration (m/s^2)
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I=Q/t
current (A) = charge (C) ÷ time
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P=E/t
power (W) = energy (J) ÷ time (s)
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P=IV
power (W) = current (A) x potential difference (V)
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p=mv
momentum (kg m/s) = mass (kg) x velocity (m/s)
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Q=It
charge (C) = current (A) x time (s)
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R=V/I
resistance (Ω) = potential difference (V) ÷ current (A)
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v=d/t
speed (m/s) = distance travelled (m) ÷ time taken (s)
How would you use this equation in an exam?
V=W/Q=E/Q
potential difference (V) = work done (J) ÷ charge (C) = energy transferred (J) ÷ charge (C)
