MCAT Physics 2

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  1. Gravity definition
    A field that exists between any two objects with mass.
  2. Field definition
    An invisible influence that can exert a force on a mass or charge.
  3. Universal Law of Gravitation (force due to gravity)
    Image Upload

    (In space)

    F = mg

    (Near earth)
  4. Formula for gravity, strength of gravitational field, acceleration due to gravity
    Image Upload
  5. Gravitational Potential Energy
    Image Upload

    (In space)

    PE = mgh

    (Near earth)
  6. Friction facts
    • Friction opposes sliding not motion.
    • If there is sliding, it's kinetic friction; if there's no sliding, it's static friction.
    • Static µ is always greater than kinetic µ.
    • Surface area does not increase friction when the mass is the same.
  7. Force due to friction formula
    Ff = µ(s/k)FN

    Ff = µ(s/k)mgcosImage Upload
  8. Force down an inclined plane formula
    F = mgsinImage Upload
  9. Normal force on an inclined plane formula
    FN = mgcosImage Upload
  10. Velocity at the base of an inclined plane
    Vf = √(2gh)
  11. Hooke's Law
    F = k∆x

    • x - displacement
    • k - spring constant
  12. Elastic Potential Energy formula
    Image Upload
  13. Simple Harmonic Motion formulas
    T = 2π√(m/k)

    (mass on a spring)

    T = 2π√(L/g)


    • T - period (time/wave)
    • m - mass
    • k - spring constant
    • L - length of pendulum
    • g - gravity
  14. Equililbrium terms
    • Terminal velocity
    • Constant velocity
    • Objects at rest
    • Balanced fulcrums or boards on strings
    • Objects floating in liquid
  15. Torque and lever arms
    • T = FImage Upload
    • T = mgImage Upload
    • T = FrsinImage Upload

    • Image Upload - lever arm
    • r - distance between the force and the point of rotation.
    • rsinImage Upload - always equals Image Upload, but r = Image Upload only when Image Upload = 90˚
  16. Solving for systems in and not in equilibrium
    Equilibrium - list all the forces and put them equal to one another.

    Not Equilibrium - list all the forces and add "ma" to the loosing side.
  17. Circular motion formula
    Image Upload
  18. Centripetal vs. Centrifugal
    If a string is pulling a ball into a circular motion, the string's force on the ball is centripetal and the ball's force on the string is centrifugal.

    Centrifugal does not exist.
  19. Angular motion formulas
    Image Upload

    Image Upload

    • Image Upload - angular frequency (rad/s)
    • v - tangential velocity (m/s)
    • r - radius (m)
    • f - frequency (Hz)

    For the MCAT angular frequency and angular velocity are synonymous.
  20. Rotational equilibrium
    • An object is in rotational equilibrium if:
    • 1. It is NOT rotataing
    • 2. It is rotating with a constant angular velocity/frequency
  21. Momentum
    Image Upload

    momentum is inertia increased by velocity and is always conserved (remains constant) in an isolated system.
  22. Impulse
    • Impulse = ∆Image Upload
    • Impulse = m∆v
    • Impulse = Favgt

    • If there is no change in velocity, there can be no impulse.
    • The greater the change in velocity the greater the change in impulse.
  23. Elastic Collisions
    • (KE1 + KE2)before + (KE1 + KE2)after
    • In elastic collisions momentum and energy are both conserved.
  24. Inelastic Collisions
    m1v1 + m2v2 = m1v1 + m2v2

    In inelastic collisions momentum is conserved but energy is not. For perfectly inelastic collisions the equations becomes:

    m1v1 + m2v2 = (m1 + m2)v3
  25. Stress
  26. Strain
    ∆dimension/original dimension
  27. Modulus of elasticity (ME)

    • Young's modulus - simultaneous pushing or pulling, perfectly lined up with one another.
    • Shear modulus - simultaneous pushing or pulling not perfectly lined up.
    • Bulk modulus - simultaneous compression from all sides.
  28. Thermal expansion formula
    ∆L = Image UploadLo∆T

    • T - temperature
    • L - length in inches
    • Image Upload - coefficient of thermal expansion
  29. Internal energy
    The energy of internal vibrations of molecules or atoms within a system.
  30. Heat energy
    Energy dissipated as heat. On the MCAT this usually means heat dissipated from a collision.

    Heat energy and internal energy are almost synonymous.
  31. Chemical energy
    The energy contained within chemical bonds, or the energy stored/released due to the separation and/or flow of electrons.
  32. Mechanical energy
    ME = KE + PE
  33. Work formulas
    • W = ∆Energy
    • W = FdcosImage Upload

    Units - Joules (Image Upload) or (Image Upload)
Card Set:
MCAT Physics 2
2012-08-02 19:33:29

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