PhysicsCh3

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Author:
victimsofadown
ID:
203504
Filename:
PhysicsCh3
Updated:
2013-02-26 05:30:36
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PhysicsCh3
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PhysicsCh3
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  1. What are the two ways that a vector can be described?
    • Magnitude and angle
    • Components (X and Y)
  2. Adding vectors
    • A+B = C
    • Components: Ax+Bx = Cx , Ay+By = Cy
    • Graphically: graphing from head to tail

    • A-B = C
    • Components: Ax-Bx = Cx , Ay-By = Cy Graphically: graphing from head to head
  3. When adding vectors (componently), a vector with magnitude V making an angle θ with the x axis has what components?
    Given the components, what is the vector's magnitude and direction?
    • Vx = Vcosθ, Vy = Vsinθ
    • V = √(V2x+V2y), tanθ = Vy/Vx
  4. Projectile Motion - information without equations
    • Break down into two motions (X and Y) which are completely independent of eachother.
    • The Y motion has acceleration of -g
    • The X motion has no acceleration!
  5. Projectile Motion - equations based on components
    • y = y0+V0yt-1/2gt
    • Vy = V0y-gt
    • Vy2-Vy02 = -2gΔy
    • x = x0+V0xt
    • Vx = V0x
  6. How do an object dropped horizontally and thrown vertically compare?  Why?
    They will both land at the same time, because the ONLY acceleration acting on both is -g.  It may start with V, but NOT ACCELERATE
  7. What is relative velocity? How is it used practically?>
    • Relative velocity is a reference to moving in/on something that is already in motion.
    • Ex - walking 4m/s backwards on a train moving 8m/s forward
    • Depending on which reference you are using the net velocity will be different!

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