Algodoo

As You see. Its A Cat, With Wheels And It has Engine(White Circle) And Red Hinge with AutoBrake

And this Box with lasers is gearbox, It should edit Red Hinge's MotorTorque

The Red Laser on hit, Red Hinge's MotorTorque must be 0.1
The yellow Laser on hit, Red Hinge's MotorTorque must be 50000

When MotorTorque is High, Speed Will Increase.