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)

    (In space)

    F = mg

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

    (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)mgcos
  8. Force down an inclined plane formula
    F = mgsin
  9. Normal force on an inclined plane formula
    FN = mgcos
  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
  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 = F
    • T = mg
    • T = Frsin

    • - lever arm
    • r - distance between the force and the point of rotation.
    • rsin - always equals , but r = only when = 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
  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

    • - 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

    momentum is inertia increased by velocity and is always conserved (remains constant) in an isolated system.
  22. Impulse
    • Impulse = ∆
    • 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 = Lo∆T

    • T - temperature
    • L - length in inches
    • - 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 = Fdcos

    Units - Joules () or ()

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MCAT Physics 2
2012-08-02 19:33:29

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