Ch.2 Physics: Motion along a straight line

Ch.2 Physics: Motion along a straight line

1. 2.1 Position, Displacement, and avg. Velocity

   • Displacement
     • delta x= x2-x1
       • from position 1 to position 2
         • Always a (+) or (-) direction.
           • Determined by direction traveling to/away from an orgin
             • Vector Quantity:
               • When (+) has moved in (+) direction on x-axis
   • Position
     • x
   • Average velocity
     • What is the difference between average speed and average velocity?
       • average speed is always (+)
         • shows magnitude
     • v(avg)=deltax/deltat
       • change in distance over change in time
         • Position vs. Time
           • m/s
             • 2.2 Instantaneous Velocity and Speed
               • Instantaneous Velocity
                 • actually just velocity
                   • • Shrinking time interval closer and closer to 0
                       • derivative of x(t) graph
                       • 2.3 Acceleration
                         • derivative of Velocity graph
                           • acceleration units
                             • m/s^2
                         • a (avg)
                         • 2.4 Constant Acceleration
                           • Equations for motion
                             • Only for constant acceleration
                               • if missing x-xi
                                 • • What if we are missing v?
                                     • • What if a is missing?
                                         • • missing t?
                                             • • What if we are missing vi?
                   • On graph displacement vs. Change in time
               • Speed
   • Avg Speed
     • s(avg)= total distance/ change in time

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