Units & Kinematics I.txt

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Author:
it2007
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222382
Filename:
Units & Kinematics I.txt
Updated:
2013-06-04 11:01:28
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mcat Kaplan Physics Units Kinematics
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Units and Kinematics I
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  1. 10x, name x for each one of the following cases:
    giga
    kilo
    nano
    pico
    mega
    centi
    micro
    milli
    • 9
    • 3
    • (-9)
    • (-12)
    • 6
    • (-2)
    • (-6)
    • (-3)
  2. (4x10-10)(5x1014)=
    20x104=2x105
  3. Sin(0°)
    0
  4. Sin(30°)
    1/2
  5. Sin(45°)
    √2/2
  6. Sin(60°)
    √3/2
  7. Sin(90°)
    1
  8. Sin(180°)
    0
  9. Cos(0°)
    1
  10. Cos(30°)
    √3/2
  11. Cos(45°)
    √2/2
  12. Cos(60°)
    1/2
  13. Cos(90°)
    0
  14. Cos(180°)
    -1
  15. Log45=x means?
    10x=45
  16. SOH-CAH-TOA
    • Sin is Opposite over Hypotenuse
    • Cos is Adjacent over Hypotenuse
    • Tangent is Opposite over Adjacent
  17. Kinematics is...
    a branch of Newtonian mechanics that deals with the description of motion.
  18. Give an example of a Kinematics problem describing motion in only one dimension
    Dropping objects problem
  19. Give an example of a Kinematics problem describing motion in two dimensions
    Projectile motion problem
  20. Define displacement.
    Is it a scalar or vector quantity?
    SI units
    an object in motion experiencing a change in its position in space undergoes displacement.

    It's a vector quantity, connecting in a straight line the objects initial and final positions.

    m
  21. Define velocity.
    Scalar or vector?
    SI units
    Rate of change of displacement in a given unit of time.

    Vector.

    m/s
  22. Define speed.
    Scalar or vector?
    SI units
    • Rate of actual distance traveled in a given unit of time.
    • Scalar.
    • m/s
  23. Define acceleration.
    Scalar or vector?
    SI units
    • Rate of change of velocity over time.
    • A~ results from application of force(s).
    • Vector
    • m/(s^2)
  24. Newton's 2nd Law
    F=ma
  25. On MCAT when you see Force, think
    • Acceleration
    • And when you see Acceleration, think Force.
    • MCAT limits kinematics problems to those involving motion with constant acceleration.
  26. Define and name examples of linear motion problems.

    What are directions of v and a in linear motion?
    Motion along a line.

    Along a line (both v and a)

    • Examples:
    • (1) motion along a vertical path
    • (2) motion along a horizontal path
    • (3) motion along an inclined surface or ramp
  27. Summary of kinematics equation (5 of them)
     vec v = vec v_0 + vec a t

     vec{x}=vec{x}_0 + vec{v}_0 t+frac{vec{a}t^2}{2}

     v^2 = v_0^2 + 2vec{a}cdot(vec{x}-vec{x}_0)

    Δx=1/2*(v0+v)*t = v(bar)*t

    v(bar) = 1/2*(v0+v)
  28. Projectile motion is...
    Give an example.
    ...motion that follows a path along two dimensions.

    Two dimensions (usually horizontal and vertical) are independent of each other and must be analyzed separately.

    E.g.: cannonballs (pushka, zarbazani), baseballs, bullets...

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