MCAT Physics 1

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MCAT Physics 1
2012-08-02 15:34:36

Physics 1
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  1. Average velocity
    Vavg = (V1 + V2) / 2
  2. Determining height reached
    Time to reach peak * average velocity
  3. Determining horizontal distance
    Total time in air * X component of Vinitial
  4. Net force = 0 means...
    No acceleration. Can however have velocity but a = 0
  5. If volume changes, is work being done?
  6. Tension is...
  7. Vector attributes
    Has both magnitude and direction.
  8. Scalar attributes
    Has only magnitude
  9. Newton's first law
    The velocity of a body remains constant unless the body is acted upon by an external force.
  10. Newton's second law
  11. Newton's third law
    For every action there is an equal and opposite reaction.
  12. Inertia definition
    The ability of an object to resist a change to its velocity.
  13. Center of Mass formula
    Cmass = (r1m1 + r2m2 + r3m3...)/mtotal

    r - the displacement vector between a reference point and each vector.
  14. Center of gravity
    At the center of mass.
  15. Center of buoyancy
    The geometric center, irrespective of the center of mass.
  16. "Constant Velocity" or " Constant Speed" means
    • No acceleration
    • No NET force
    • All forces sum to zero
    • No change in direction
    • The object is in equilibrium
  17. Distance or height traveled formula
    Distance = rate * time
  18. Range (horizontal distance traveled) formula
    Range = Vx * time
  19. When facing projectiles think:
    • Horizontal velocity never changes (ignoring wind resistance)
    • Horizontal acceleration always = 0
    • Vertical acceleration always = 10 m/s2
    • Vertical behavior is always symmetrical (upward = downward)
    • Time in the air depends on the vertical component of velocity only.
    • Range depends on both the vertical and horizontal components.
    • Time is always the same for both the x and y components of the motion.
  20. Formula for displacement in projectile motion
    X = 1/2at2
  21. Formula for final velocity when only height is given
    V = √(2gh)
  22. Formula for "round trip" or total time in air
    tair = 2V/g

    V must be the vertical component of initial velocity
  23. The effect of surface area on air resistance
    Greater surface area = more air resistance
  24. The effect of shape on air resistance
    Less aerodynamic = more air resistance
  25. The effect of contour on air resistance
    Rough surface = more air resistance
  26. The effect of velocity on air resistance
    Greater velocity = more air resistance