Measure the motion of a cart down a ramp


               Distance travelled (cm)

                x1               x2                x3              x4


            10.0 +/-          20.0 +/-          40.0 +/-         70.0 +/-
           ______________     ______________    _____________    ____________



                t1               t2                t3              t4
Avg time

           _______________    ______________    _____________    ____________

Now we will use these changes in positions, and these intervals of time, to figure out the average velocities. We'll also figure out the appropriate time for each velocity.


                midpoint               midpoint           midpoint
            between t1 and t2     between t2 and t3     between t3 and t4
                                         
         
time (s)    _______________         ________________     __________________



  
              avg velocity           avg velocity         avg velocity
            between t1 and t2     between t2 and t3     between t3 and t4


velocity    _______________          ________________     __________________