Collision with drag object

I’m trying to set up an effect of hitting one object with another using an explicit drag by the user. I have 2 spheres in my scene. The first sphere I have coded drag behavior, which works great. The 2nd sphere is the object I want to hit. I’ve applied colliders and rigid bodies to both and the effect is somewhat working, but the problem is that the 2nd sphere is only getting pushed out of the way and not bouncing or reacting with the energy of the drag.
I have a physics material applied to the 2nd sphere with high bounce, which I have tested using gravity bouncing off a ground plane; it is very bouncy.

My guess is that the physics engine is not taking into account the drag velocity of the 1st sphere, so when the collision occurs it is treating it like a static object. How can I overcome this? I’d like the interaction to be fully controllable by the drag, from a gentle nudge to a hard smack.

Any ideas? Thanks.

I reckon that your drag routine alters the TRANSFORM of the draggable sphere, right?
By doing this, you’re ‘hacking’ the physics, since the ‘only’ way to interact with a fully physics-driven object (to achieve bounces and all those other physical effects you expect) would be to apply FORCES to it, rather than translations of its transform.

The solution would be to implement a script that creates a joint on the mouse’s 3d position, to which you attach the sphere, which will thus behave as a demolition crane’s ball.

so basically:

 - click the scene, create a joint
 - attach the sphere to the joint
 - drag around and smash stuff!

Voila.

Its a video of what accepted answer is saying.