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MCAT Physics

  1. Kinematics (Linear and projectile motion)
    Image Upload 2

    Image Upload 4

    Image Upload 6
  2. Kinematics (displacement vs. distance, average velocity vs. average speed, acceleration)
    Displacement is the change in position independent of path length

    Distance is the length of the path

    Average velocity is displacement over time

    Average speed is distance over time

    Acceleration is v/t
  3. Work and Power
    • W=Fdcosθ
    • Wnet=ΔKE
    • If force is perpendicular to displacement, work is zero
    • Power = W/t or Fvcosθ
  4. Kinetic Energy, Potential Energy, Total mechanical Energy, Mechanical Advantage, Work-energy theorem, conservation of energy, mechanical advantage
    • KE=1/2*mv^2
    • PE=mgh
    • E=PE+KE
    • W(total)=ΔKE
    • KE+PE(initial)=KE+PE(final)
    • Increase distance causes a lower force
  5. Momentum, impulse, conservation of momentum, elastic collision, inelastic collision, perfectly inelastic collision
    • p=mv
    • J=F(average)t=Δp
    • p(initial)=p(final)
    • KE(initial)=KE(final)
    • KE(initial) doesn't = KE(final)
    • Objects stick and move together
  6. Newton's Laws
    A body in motion is stay in motion (same for rest) unless acted upon by a net force

    A body will be accelerated in the same direction of the net force applied to it (F=ma)

    All forces are equal and opposite in direction

    All matter experience attractive force Image Upload 8
  7. Frictional forces (Static, Kinetic, centripetal)
    0≤fs≤μsFN

    fk=μkFN

    Ac=v2/r

    Fc=mv2/r
  8. Center of mass and torque
    Xcm=(m1x1+m2x2+...)/(m1+m2+...)

    τ=rFsinθ=lF

    r1mgsinθ=r2Fsinθ
  9. Fluids (density, specific gravity, weight, absolute pressure, gauge pressure)
    ρ=m/V

    ρsubstance/ρwater

    ρgV

    P=F/A


    • Absolute pressure = atmospheric pressure (typically 105 Pa) + ρgh
    • Gauge pressure = absolute pressure-Patm
  10. Buoyant Force, Floating objects, Flow rate, continuity equation, Bernoulli's equation, Pascal's principle, velocity, relationships
    Fb=ρgVsubmerged

    Fractions of floating object that is submerged = ρobject/ρfluid

    A1v1=A2v2

    P+1/2ρv2+ρgh (for state 1)=P+1/2ρv2+ρgh

    ΔP=A1F2=A2F1 and W=F1h1=F2h2

    Image Upload 10

    velocity inverse with area and pressure
  11. Coulomb's Law, Electric field, Electric potential, Potential difference, Electric potential energy
    F=kq1q2/d2


    E=F/q=kq/d2

    • V=kq/d
    • U=qΔV=kq1q2/d
  12. Current, Ohms Law, Power, Resistance
    Current is the flow of electric charge; opposite of electron flow, electrons flow from negative terminal through circuit to positive terminal)

    V=IR

    P=IV=I2R=V2/R

    Image Upload 12
  13. Series circuits
    Req=R1+R2+R3+...

    I=I1=I2=I3=...

    V=V1+V2+V3+...
  14. Parallel circuits
    Req=(R1+R2+R3+...)-1

    I=I1+I2+I3+...

    V=V1=V2=V3=...
  15. Capacitance, Energy stored, Equivalent capacitance
    C=Q/V (farad)

    PE=1/2QV=1/2CV2=1/2Q2/C

    Adding dielectric increases capacitance

    Series: Ceq=(C1+C2+C3+...)-1

    Parallel: Ceq=C1+C2+C3+...
  16. Magnetic force on charge+RH rule, force on current-carrying wire + RH rule, magnetic field
    FB=qvBsinθ (fingers in B, thumb in v, palm is FB)

    qvB=mv2/r

    FB=ILBsinθ (thumb points in direction of current, fingers curl in B)

    B=μ0I1I2/d (Tesla)
  17. Period, Frequency, angular frequency, simple harmonic motion, mass spring (force, energy, frequency)
    T=seconds/cycle

    f=1/T or cycles/second

    ω=2πf

    Period and frequency are independent of amplitude

    Fs=-kx, PE=1/2kx2, Image Upload 14
  18. Pendulum (frequency, at equilibrium, at amplitude)
    Image Upload 16

    Equilibrium: v is max, a = 0, KE is max, PE=0

    Amplitude: v=0, a is max, KE=0, PE is max
  19. Wavelength, Young's modulus, velocity, string attached at each end, open pipe, closed pipe
    v=fλ

    Young's Modulus = (F*L0)/(A*ΔL)

    Image Upload 18

    String: λn=2L/n (n=1,2,3...)

    Open pipe: λn=2L/n (n=1,2,3...)

    Closed pipe: λn=4L/n (n=1,3,5...)
  20. Speed of sound relationships, intensity, Beats, Doppler effect
    higher density = lower resistance to compression = lower spreed

    Image Upload 20

    fbeat=|f1-f2|

    Image Upload 22 (Vo is + if observer moves toward source; Vs is - if source moves toward observer, + on top and - on bottom if both coming closer)
  21. Light, diffraction, refraction, snell's law
    • lights is an electromagnetic wave that does not need a medium
    • wsinθ=nλ (n=1,2,3...)
    • n=c/v
    • n1sinθ1=n2sinθ2 (n2>n1 light bends toward normal)
  22. Mirrors
    Spherical: Real images formed on same side as object; virtual images formed on side opposite of object

    • Concave: f=r/2, CCMIBEV (ConCave Mirror Inside focal length image is Behind mirror, Enlarged, and Virtual)
    • Convex: f=-r/2, CVMVUO (ConVex Mirror Virtual Upright Only)
  23. Lenses
    Converging: f is positive, CVLBRI (ConVerging Lens Beyond focal point image is Real and Inverted) Diverging: f is negative, DVLVSSO (DiVerging Lens Virtual Image Only Same-side Smaller )
  24. Mirror/lens equation, magnification equation
    1/f=1/do + 1/di

    m=-i/o
  25. ljlk
    kjllkj
Author
omar10315
ID
304422
Card Set
MCAT Physics
Description
MCAT Review
Updated

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