Equations and important concepts

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Author:
raquelvsuarez
ID:
273569
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Equations and important concepts
Updated:
2014-05-07 02:14:38
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MCAT physics Chad
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Equations and Important concepts Chad's videos All Physics' days
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  1. Sin (0)
    0
  2. Sin(30)
    0.5
  3. Sin(45)
    0.7
  4. Sin(60)
    0.87
  5. Sin(90)
    1
  6. Cos(0)
    1
  7. Cos(30)
    0.87
  8. Cos(45)
    0.7
  9. Cos(60)
    0.5
  10. Cos(90)
    0
  11. SOH CAH TOA
    • Sin (θ)= O/H
    • Cos (θ)= A/H
    • Tan (θ)= O/A
  12. Force m*a
    • Mass*acceleration
    • Kg*m/s²
  13. Joules derivation-using work formula
    • W=F*d
    • J=N*m
    • J=(Kg*m/s²)*m
    • J=Kg*m²/s²
  14. Joules derivation-using Energy formula
    • KE=1/2mv²
    • J=Kg(m/s)²
    • J=Kg*m²/s²
  15. PE:mgh
    • J=Kg(m/s²)m
    • J=Kg*m²/s²
  16. Watts derivation-using the power formula
    • P=W/T Power=Work/Time
    • W=J/s
    • W=N*m/s
    • W=(Kg*m/s²)(m/s)
    • W=Kg(m²/s²)
  17. Vector
    Magnitude + direction
  18. Scalar
    Magnitude ONLY
  19. Displacement vs distance
    • Displacement is how far you are from where you started in a straight line path,while distance is the total steps you took to get there regardless of the path.
    • Displacement is a vector
    • Distance is a scalar
  20. Velocity
    • V=∆d/∆t
    • Velocity equals the change in distance over time
    • m/s
  21. ****Note: Velocity includes both magnitude and direction, speed is only the magnitude
  22. Acceleration
    • a=∆V/T
    • Acceleration equals the change in velocity over time
    • m/s²
  23. ****Note: Since acceleration is proportional to Velocity, when velocity changes EITHER IN MAGNITUDE OR DIRECTION, acceleration changes!
  24. @Rest=no acceleration
    Constant velocity=no acceleration
  25. Gravity 10(m/s)/s
    • *Every second your velocity changes by 10m/s
    • -Sec 0= 0m/s
    • -Sec 1= 10m/s
    • -Sec 2= 20m/s
  26. When is g positive or negative in a problem?
    Consider the three variables: Acceleration (a), Velocity (V) and Displacement (d)
  27. *if all three point in the same direction, then it doesnt matter, they can all be + or -
    *If one of them points in a different direction, then you have to pick a point of reference and stick to it.
  28. Which equation can be use when there is NO a? d=vt
    distance=velocity*time
  29. Which set of equations is available when there is a?
    • d=(Vavg)(t)
    • d= Vi*t + (1/2)at²
    • Vf²=Vi² + 2ad
    • Vf= Vi + at
    •  or     *When Vi=0
  30. d=(Vavg)(t)
  31. d= Vi*t + (1/2)at²
  32. Vf²=Vi² + 2ad
  33. Vf= Vi + at
  34. In the graph of Displacement vs Time, what does the slope mean? Does the area under the curve have any meaning?
    • The slope is Velocity
    • No, the area under the curve is useless
  35. In the graph of Velocity vs Time, what does the slope mean? Does the are under the curve have any meaning?
    • The slope is acceleration
    • Yes, the area under the curve is displacement
  36. What's Newton's first law?
    , then velocity is constant

    *A body in motion will stay in motion if no there is no net force being applied on the body. Or a body at rest will stay at rest unless there is a net force being applied on the body
  37. What's Newton's second law?


    Force=mass*acceleration
  38. What's Newton's Third Law?


    Every force has an equal and opposite force

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