Physics Review

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  1. What is the coordinate plane?

    - How is it named? What are the points?
    a plane that has two axes

    Y versus X

  2. __ do not give you lines. Why not?
    Spatial plots. 

    If a point object moves at any time, its a point object. As you move it, it represents a change in y
  3. If you have a straight line in Y v. T graph, what does that mean?
    the object is standing still
  4. What does dimensional analysis focus on?
    the ratio of length versus time, but not the actual units
  5. A horizontal line indicates a slope of __. Why?
    • zero
    • there's no change
  6. An axis of time enables __.
    study of the rate
  7. When calculating slope, what must we do?
    draw a triangle, assign opposite, adjacent, and hypotenuse, and use trig to get it
  8. What is slope?
    the ratio of rise over run, which also denotes the change in speed
  9. What does a straight line indicate?
    there is no change in rate/ speed. Slope is zero
  10. What is the slope of the slope called?
    the accepleration (slope of the speed)
  11. If moving at aconstant speed, what does that mean for acceleration?
    there is no change in acceleration
  12. If you have a change in speed, you have __
  13. What is velocity?
    the speed of something
  14. Length/ Time is what?
    speed (aka: rate)
  15. Speed/ Time (L/T2) is what?
  16. __ has no special units
  17. The rate at which acceleration is changing is __
    (L/T2) (1/T)
  18. If I drop a marker from my eye level to the floor, how will the line look? Why? 

    What is changing?
    the position of the object and the time are changing. Both are increasing. A change means it is not a horizontal line. It can't be a slanted line because that indicates consistency in slope with an initial speed when our speed is zero. It would be a curve upward with the slope increasing (speed increasing)
  19. What is acceleration?
    a change in speed per time

    slope in velocity versus time
  20. What does a decreasing acceleration mean?
    you're still accelerating but easing up on the gas
  21. To go from L v. T to V. versus T., what must you do?
    draw a tangent to the curve, get slope at T1 plot on V/T and repeat
  22. If the VT graph has a slope, what does that mean?
    V must be changing. It has an acceleration
  23. What is the acceleration of gravity?
    9.8 /s2 (g=gravity)

    32 f/s2
  24. Since acceleration is constant, it is __, which is why we don't do what?
    not changing

    take the rate of acceleration. Most of the time, acceleration doesn't change with time
  25. How can you tell the difference between 1D and 2D?
    2D problems have two distances. You need to have two dimensions to draw an arc. With/ a straight line, it is always one dimensional. 

    With 2D, you need both x and y. With 1D, you need x or y. With 2D, you need three axes: x, y, and T
  26. With Y versus T, a horizontal line tells us __. 

    With Y versus X, a horizontal line tells us __.
    its changing

    nothing. We don't know how
  27. A rate graph is what?
    velocity versus time. So a zero slope equals no movement
  28. What does a changing velocity tell us?
    that there is acceleration
  29. If you drop a ball, can it go higher than when you started? Why or why not?
    No, because the ball deforms, pushing out air, and losing energy in the form of heat
  30. If you want the ball to go higher, what do you do?
    throw it
  31. If an object is falling, what kind of motion is it?
    straight line motion
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Physics Review
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