Fisica. One Dimensional Kinematics

  1. Distance
    Total length of travel, from beginning to end. The distance is always positive.
  2. Displacement
    Displacement, Δx, is the change in position:

    Δx= x- xi

    Can be positive, negative, or zero.
  3. Positive and Negative Displacement
    The sign of the displacement indicates the direction of motion.

    • Δx>0 motion to the right
    • 0<Δx motion to the left
  4. Units (displacement & distance)
    The SI unit of distance and displacement is the meter, m.
  5. Average Speed
    • Average speed is distance divided by elapsed time:
    • average = distance/time

    Never negative
  6. Average Velocity
    • Average velocity, vav, is displacement divided by time:
    • Vav=Δx/Δt=Δf-xi/tf-ti

    • Positive if motion is in the positive direction.
    • Negative if motion is in the negative direction.
  7. Units (velocity & speed)
    The SI unit of speed and velocity is meters per second, m/s.
  8. Instantaneous velocity
    The velocity at an instant of time is the limit of the average velocity over shorter and shorter time intervals:

    Can be positive, negative, zero, with the sign indicating the direction of motion.
  9. Constant Velocity
    When velocity is constant, the
  10. Graphical interpretation of velocity
    In a x-versus-t plot, the average velocity is the slope of a line connecting two points.
  11. Graphical interpretation
    in a x-versus-t plot, the instantaneous velocity at a given time is equal to the slope of a tangent line at that time.
  12. Average acceleration
    is the change in the velocity divided by the change in time.

    • Its positive if Vf>Vi
    • its negative if Vf<Vi
  13. Instantaneous Accelaration
    the limit of the average acceleration as the time interval goes to zero.
  14. Constant acceleration
    instantaneous acceleration is equal to the average acceleration.
  15. decelaration
    an object whose speed is decreasing is said yo be decelerating. whenever V and acceleration have opposite signs.
  16. Graphical interpretation
    in a v-versus-t plot, the instantaneous acceleration is equal to the slope of the tangent line at a given time.
  17. Units
    The SI unit of acceleration is meters per second per second, or m/s^2
  18. Acceleration due to gravity
    varies slightly on the earths surface from place to place. Always a positive quantity.
Card Set
Fisica. One Dimensional Kinematics
Putting Physics in context