Physics

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Author:
phoenixbird56
ID:
113761
Filename:
Physics
Updated:
2011-11-01 18:37:18
Tags:
physics test thursday newton energy work power vector mechanics linear nonlinear motion machines efficiency more
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Description:
huge test thursday :)
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  1. What did Galileo find in his experiment on the Leaning Tower of Pisa?
    Mass does not matter (mass does not affect the amount of time it takes for an object to hit the ground.)
  2. Inertia
    the property of a moving object to continue moving (if object has inertia it will continue moving forever)
  3. Velocity
    measure of both speed AND direction
  4. Acceleration
    the rate of change in velocity
  5. formula for acceleration
    a=(change in) v/(change in) t
  6. formula for velocity in free fall
    v=gt
  7. formula for velocity on a surface (horizontal)
    v=(change in) d/(change in) t
  8. acceleration in free fall (on earth)
    10m/s2 (ignoring air resistance/friction) (technically 9.8 m/s2 with air resistance/friction)
  9. free fall
    occurs when an object is free of all restraints and falls under the influence of gravity alone
  10. distance formula
    d=1/2 g t2
  11. formula for work
    W=Fd
  12. formula for power
    P=W/t (units:watts)
  13. pathagorean theorem formula for resultant vector
    a2+b2=R2
  14. vector
    any quantity that requires both magnitude ( value) and direction
  15. scalar
    a quantity that can be described by magnitude alone
  16. projectile
    any object that is projected by some means and continues in motion under the influence (something you throw once it is out of you hand)
  17. Trajectory
    the path a projectile takes
  18. which angle will go the farthest if you project something at that angle?
    45o
  19. tangential speed
    speed of something moving in a circular path
  20. rotational speed
    refers to the number of rotations per unit time
  21. Newton's 1st Law of Motion
    evey object continues in its state of rest or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it (objects in motion stay in motion, objects at rest stay at rest unless acted upon by an outside force)
  22. Newton's 2nd Law of Motion
    The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. (a~F, 1/2a=2xm)
  23. Newton's 3rd Law of Motion
    Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. (for every action there is an equal and opposite reaction)
  24. Force fomula (2nd law)
    F=ma
  25. acceleration formula(2nd law)
    a=F/m
  26. Potential energy formula
    PE=mgh
  27. Kinetic Energy formula
    KE=1/2 m v2
  28. efficiency formula
    efficiency=useful energy out/total energy in (%)
  29. Fulcrum problems fomula
    Fd(in)=Fd(out)

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