I just want a RigidBody2D to sit on another moving platform, but if you place one it does not move with the platform its sitting on.The problem is that I want to stack one by one RigidBody2D and every one of them should have physics can someone explain how to do this, i am completely new to unity. : )
Lotsa ways depending on what you need. You can reparent them and remove the rigidbodies while they’re connected, you can use various types of joints to connect them, you can give them more friction so they don’t slide around so much. With physics you have to tinker to find out what is actually going on before arriving at a solution.
I would go to YouTube and watch some moving platform tutorials. Solution is also depending on if you are using Physics2D or Physics. For Physics2D it is pretty easy to do.
Edit: so is the problem actually not the moving platform part? But actually stacking of objects on a moving platform?