Motion Lab
Features:
1) Adjust "time" slider to change clock and move car if speed is more than 0
2) maxtime allows the clock to go from one hour to 12 hours
3) speed sets the speed, and the slope of the line
4) initial position moves curve up and down and moves car horizontal
5) moving point I shows the slope triangle
6) little black arrow under the position vector is the velocity vector
7) Use the controls in the menu bar to vary zoom in and out and so on