constant, a0, net force0Air track with one cart
| Horizontal | V=constant, a=0, no net Force |
| Tilted | V constant, a0, net force0 |
One can measure acceleration via d=1/2at^2 
a=2d/t^2
A tilt of 2-3" at one end produces t
4 sec with d2meters
Two 3/4" boards yield t5 sec and a a0.15 m/sec^2 with d=2 meters
