Eventually, it will seem to “phase” through a wall because it is too fast to be detected by the physics system. This is because each bounce reverses and multiplies the velocity by 1.1 and as friction is zero, nothing can stop it.
Now you can run the game and see the particle bouncing up and down with increasing power. This image attempts to illustrate how to drag & drop a Physics 2D Material from the Project window to the Material field of a Collider component. Now choose Physics 2D | Circle Collider 2D. Now you can run the game and see the particle object come to rest on the bottom-wall object. Select the particle object then click Add Component.
We can fix this by adding a Collider component to the particle. If you ran the game at this point, you might be disappointed to see the particle object still falls through the wall at the bottom. Do the same for each of the other three walls and the destroyer object. Select the bottom-wall object then click the Add Component button in the Inspector Window. It just so happens that each of the four walls and the destroyer object are nicely shaped rectangles. The quickest and easiest collider to add for any game object, that is shaped like a square or rectangle, is a Box Collider 2D. There are several different types of colliders for 2D objects and we will see three of them next. Let’s fix that by adding Collider components Making Unity objects bump with Colliders The issue we have now is that the particle falls straight through the bat and the walls.
Now, if you run the game, only particle will fall. For now, making them all Kinematic except for particle achieves what we need. Tip: Later in the tutorial we will need to change one of these settings. Set all the objects except for particle to Is Kinematic.
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