build car

I have built a car using the below idea but
http://developer.anscamobile.com/code/billy-cart-corona

q1) the car just bounces around when I put this on a simple ground etc? does anyone know why?

q2)is this the only way to build a car because I have tried other ways but this jumps beter than other cars I made. Other than that I really didnt like this Billy Cart example as the car just doesnt move well over bumpy terrain/hills. Flash box2d is much easier to make a car and move so I am thinking maybe this cant really be done that well. [import]uid: 138547 topic_id: 26621 reply_id: 326621[/import]

I give up on the billy cart example as it doesnt work with images and the gravity effects on the car are not simple either.
It is a line drawing example which seems to be 'not adapatable’with peformnace in a function type design which doesnt lend itself well to OOP.
The cart doesnt move logically and has this annoying bounce when moved off lines and onto images for a ground.

Unless there is another example of a cart/vehicle then I cant use Corona for such a movement. Maybe a modified movement is the best it will do ‘no jumps’.

I tried this car and you cant set the speed on the wheels.
I would just like to know whether motor vehicle is possible or not because I havent found anything that does with images , setting speed etc

http://www.coronaforums.org/Thread-Wheel-Joint-Using-Corona-to-build-a-simple-car [import]uid: 138547 topic_id: 26621 reply_id: 108001[/import]