# Physics Equations

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1. vf = vo + at (Missing x)
x-xo = vot + (at2)/2 (Missing vf)
v2 = vo2 + 2a(x-xo) (Missing t)
Δx = vt = [(vo + vf)/2]t (Missing a)
Kinematic Equations (Translational Motion Equations)
2. Fmax = μΝ , μ is coefficient of friction, N is normal force

μk < μs always
Frictional Force
3. Fc = mac = mv2 /rac= v2 /r
Uniform Circular Motion
4. I = F Δt = ΔMM = mv
Momentum, Impulse
5. W = F d cosθ

P = ΔW/Δt
Work, Power
6. Total E = Ek + Ep

E = mc2
Energy (conservation)
7. F = -kx, k is spring coefficient

W = kx2 /2
Spring Force, Spring Work
8. A v = const.

ρAv = const.
Continuity (fluids)
9. I = Q/tR = ρl/A
Current and Resistance
10. Series - Req = R1 + R2 . . .

Paired - 1/Req = 1/ R1 +1/ R2...
Resistors (series, par.)
11. dB = 10 log 10 (I/I0 )

beats = Δ f
Sound
12. Σi = 0 at a junction

ΣΔV = 0 in a loop
Kirchoff's Laws
13. Q = mc Δ T (MCAT !)
Q = mL
Thermodynamics
14. L1 = F1× r1 (CCW + ve)

L2 = F2 × r2 (CW - ve)
Torque Forces
15. ΣFx = 0 and ΣFy = 0

ΣL = 0
Torque force at EQ
16. (sin θ1 )/(sin θ2 ) = v1 /v2 = n2 /n1 = λ1 /λ2

n = c/v
Refraction
17. F = ma
Force
18. vav = Δ d / Δ t

aav = Δ v / Δ t
Average Velocity, Average Acceleration
19. KE = Ek = 1/2 mv2

UE = Ep = mgh
Kinetic and Potential Energy
20. Ρ = F/A

Δ Ρ = ρgΔh
Pressure
21. 1/ i + 1/ o = 1/ f = 2/r = Power

M = magnification = - i/o
Optics (Power and Magnification)
22. alpha (α) particle = 2He4 (Helium nucleus)
beta (β) particle = -1e0 (an electron)
gamma (γ) ray = no mass, no charge, just electromagnetic energy
23. Δ m/ Δ t

Δ m = change in mass
Δ t = change in time
Rate of Decay
24. W = mg = Fg
Weight
25. F = ( Gm1m2 ) /r2
Gravitational Force
26. τ = rF sin Ø
Torque
27. F = mv2 /r
Centripetal Force
28. W' = ΔE = ΔK + ΔU

W = Fd cos Ø
Work
29. P = W/Δt
Power
30. p = mv
Momentum (p)
31. J = FΔt = Δp = mvf - mvi
Impulse
32. Elastic - 1/2m1v1i2 + 1/2m2v2i2 = 1/2m1v1f2 + 1/2m2v2f2
Inelastic - 1/2m1v1i2 + 1/2m2v2i2 > 1/2m1v1f2 + 1/2m2v2f2
Completely Inelastic - m1v1i2 + m2v2i2 = (m1 + m2) vf
Collisions