how to stop/suspend all motion after collision

Questions & Answers
1

I want to temporarily stop all motion of objects after an event (tap on the screen).

I can stop objects I am moving (in Update() ) by not updating their position.

But objects that have collided and have Unity given motion (physics) continue to move.

How can I temporarily suspend the motion given by the collider after collision?

Thanks for any help!

2

You can set

YourObject.Rigidbody.velocity = Vector3.zero;
YourObject.Rigidbody.angularVelocity = Vector3.zero;

This will stop the object movement unless you are applying another force somewhere. If there are other forces that you can’t controll, just zero the velocity at the end of every fixedupdate to be safe (and maybe disable gravity).
You can of course save the current velocity before zeroing it and then reapply it if you want to restart it again later.