2 rectangles, realistic collision on a side?

Hi,
I am trying to make a truck colliding with a small car. When the truck collides with the car, and the car is in front of the truck but slightly on the side, instead of rotating towards the left, it goes a little bit left then right and is being pushed on its transform.right. I would have expected the car to rotate at least 180° and to go backwards, even if it touches the truck again. I tried to play with mass, with the size of the collider box, ...

Here is a gif :

 

It's not easy to follow you on what's happening and what you want to achieve. Maybe a picture would help.

 

I edited my message.

 

could try https://docs.unity3d.com/ScriptReference/Rigidbody.AddForceAtPosition.html

or physics materials, more bounciness?

 

Gif hard to follow too.

 

You could also try changing the centerOfMass.

 

Yes great, thank you MelvMay it works now. I was using

Code (CSharp):

1. transform.position += Vector3.forward*speed;

I now use this :

Code (CSharp):

1. GetComponent<Rigidbody>().velocity = (Vector3.forward*speed) * 50;