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43 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Velocity |
v = s/t (s could be replaced with x) |
Distance over time |
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Acceleration |
a = v-u/t (u is initial velocity, v is final velocity) |
Change in velocity over time |
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SUVAT equations (4) |
v = u + a×t s = ut + 0.5×a×t^2 s = (u+v)/2 × t v^2 = u^2 + 2×a×s |
Two are on your formula sheet (know which two) One is the definition of acceleration derived The other is a derivation of a given formula |
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Force |
F = ma |
Mass time acceleration |
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The derivation of F = ma |
F = p/t = mv/t = ma |
Start with p/t |
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Weight |
W = mg |
Mass times gravitational force |
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Work (3) |
W = Fs W = Fscos(theta) W = pv (pressure times volume) |
Force times distance Force times distance times cos angle to the ground Pressure times volume |
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Moments |
Moments = F × perpendicular distance from pivot |
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Torque |
Torque = one of the two (equal and opposite) forces × the perpendicular distance between them |
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Energy (2) |
Gravitational potential = m×g×h Kinetic = 0.5×m×v^2 |
One is gravitational The other is kinetic |
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Efficiency |
Efficiency = useful output / total input ×100 |
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Power (2) |
P = w/t P = F×v |
Work over time Force times velocity |
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Momentum |
p = mv |
Mass times velocity |
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Momentum conserved |
m1u1 + m2u2 = m1v1 + m2v2 |
Total momentum before = total momentum after |
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Density |
(Italics) p = m/v |
Mass over volume |
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Pressure (2) |
On a solid: p = F/A In a fluid: p = (italics) p×g×h |
On a solid and in a fluid |
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Hooke's Law |
F = kx |
Spring constant times extension |
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Stress |
Sigma = F/A |
Force over area |
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Strain |
(round) E = x/l |
Extension over total length |
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Young's Modulus |
E = sigma / (round) E = Fl/Ax |
Stress over strain |
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Strength of an electric field |
E = F/Q |
Force over charge |
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Force on a charge |
E = - V/d |
Negative velocity over distance between plates |
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Force for a charge of -e |
F = eV / d |
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Voltage |
V = IR |
Current times resistance |
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Charge |
Q = It |
Current times time |
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Current |
I = nAvq or nAve |
Number of particles times cross-sectional area times velocity of particles times charge |
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Work |
VQ |
Voltage times charge |
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Power (3) |
P = IV P = I^2 × R P = V^2 / R |
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Energy in joules |
W = IVt |
Current times voltage times time |
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Kirchoff 1 (junction rule) |
I1 = I2 + I3 |
Current entering a point is the sum of the currents leaving the point |
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Kirchoff 2 (loop rule) |
E = IR1 + IR2 |
Total emf is the total voltage of the loop |
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Resistance in series |
R = R1 + R2 |
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Resistance in parallel |
Rt = 1/R1 + 1/R2 |
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Resistivity |
(Italics) p = RA/L |
Resistance times cross-sectional area divided by total length |
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Terminal p.d. |
V = E - Ir |
Total emf - 'lost volts' |
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Ratios in electricity (2) |
Vout = (R2 / R1+R2) × Vin Ex / Eo = l / lo |
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Frequency and Period |
(Italics) f = 1 / T T = 1 / (italics) f |
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Wave speed |
v = f × lambda |
Very furry lambs |
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The doppler effect |
(Italics) fo = (fs × v) / (v + or - vs) |
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Intensity (2) |
I = P / A I = S / 4 × pi × r^2 |
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Double Slit |
Lambda = ax / D |
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Diffraction Grating |
d sin (theta) = n lambda |
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End correction on a tube |
Lambda = 2 (l2 - l1) |
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