Algodoo

Left and Right arrows to move, And down arrow to toggle brake.
Place stuff infront (left) of The Super Pusher and go towards it and
it can push it... lol..
If you want to push really heavy things, then right click in the middle of all the wheels
and then click axle and then set Motor Speed to the max!! Now you can push heavy
things.. yay.. LOL..

And oh yeah.. It might be on brake.