Physics Mid-term

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Anonymous
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128882
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Physics Mid-term
Updated:
2012-01-18 23:47:52
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physics midterm
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physics midterm
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  1. ΔX= 1/2( V1 + Vf ) t
    • Linear Motion (x-direction) Horizontally
    • missing acceleration
  2. Vave = Xf - Xi
    t
    or ΔX
    t
    Linear Motion
  3. Aave = Vf - Vi
    t
    Linear Motion
  4. Vf = Vi + at
    • Linear Motion (x-direction) Horizontally
    • missing Δx
  5. ΔX = Vit +1/2at2
    • Linear Motion (x-direction) Horizontally
    • missing Vf
  6. Vf2 = Vi2 + 2a(Δx)
    • Linear Motion (x-direction) Horizontally
    • missing t
  7. acceleration is always equal to ...
    9.81 or -9.81
  8. What is the difference between accuracy and precision?
    precision is your ability to be able to be consistant and its repeatability.

    accuracy is how close to where you want to be.
  9. kilo = x10
    deci = x10
    centi = x10
    milli = x10
    micro = x10
    • kilo = x10+3
    • deci = x10-1
    • centi = x10-2
    • milli = x10-3
    • micro = x10-6
  10. % error =
    • absolute value signs
    • (measured value - accepted value)
    • (accepted value) x100
  11. Δy = 1/2( Viy + Vfy )t
    • Projectile Motion Vertically
    • missing acceleration (a)
  12. Vfy = Viy + gt
    • Projectile Motion Vertically
    • missing Δy
  13. Δy = Viyt + 1/2gt2
    • Projectile Motion Vertically
    • missing Vfy
  14. Vfy2 = Viy2 + 2g(Δy)
    • Projectile Motion Vertically
    • missing t
  15. What is the fastest speed called when you can fall when air gets in the way?
    Terminal Velocity
  16. Δx = Vit
    Vf = Vi
    Kinetic Equations for Projectile Motion (x direction)
  17. How do you find the resultant?
    by finding the hypotenuese of the right triangle and then finding the tangent of theta which is always <1.
  18. What are vector quantitities?
    What are scalars?
    • Vector quantitites are the size and direction.
    • Scalars are the size (magnitude)
  19. With resulting displacements find the...
    • inverse of the tangent with x or y axis
    • *don't press equal after
  20. When working with vectors watch out for negative values since we are dealing with direction as it all correalates to a coordinate graph.
    When working with displacement, your answer may also be negative as well.
  21. When dealing with vectors and projectile motion, Vfy is opposite of Viy .
    At max height Vfy = ??
    @ max height Vfy = 0 m/s
  22. What is special about the range (Δx) of two projectiles when they are fired from angles that add up to 90 degrees?
    What firing angle gives a projectile maximum range?
    What firing angle gives maximum height?
    • A firing angle of 90 degrees gives maximum height.
    • A firing angle of 45 degrees gives a maximum range.
    • When two angles are fired from angles that add up to 90 degrees they land in the same spot.
  23. Newton's 1st Law
    An object at rest stays at rest, and object in motion stays in motion unless acted on by an external net force.
  24. Newton's 2nd Law
    • The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the object's mass.
    • Fnet = ma
  25. FN = always what to contact surface?
    perpendicular
  26. Force of Friction is ...
    Ff = μFN
  27. Newton's 3rd Law
    • For every action there is and equal and opposite reaction.
    • different objects = different forces.
  28. Fg =
    mg
  29. Ac = V2tan
    r
    Circular Motion and Gravitation
  30. Vtan = 2π(r)
    T
    Circular Motion and Gravitation
  31. F = G(m1m2)
    r2
    • Circular Motion and Gravitation and the following are all equal to the universal gravitational constant.
    • F= mg = Fg = mac = m vtan2 = G(m1m2)
    • r r2
    • *common mistake is to forget to square radius in the denominator when plugging the equation into your calculator.
  32. G = 6.67 x 10-11
    Circular Motion and Gravitation

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