Applying force to a rigid body causes it to pass through colliders.

Ive got a sphere with a rigid body and a sphere collider on it. I have an object shaped like an arch I made in blender. The arch has a mesh collider on it but no rigid body. I create a plane, turn the arch on its back and lay it on the plane (like the top end of a pinball machine's play surface). I put the sphere on the same plane and use a script to .AddForce on the rigid body just once on FixedUpdate to fire it towards the arch.

The sphere takes off toward the arch but when it encounters the object instead of bouncing or following the surface of the arch it passes straight through like there was no collider on the arch.

Now the weird part. If I rotate the plane 90 degrees so the arch is at the bottom and the sphere above it. If I comment out the AddForce line in the script, so the script is basically doing nothing, and let gravity act on the sphere it falls toward the arch and when it gets to it it encounters the collider on the arch and follows the curve like I would expect.

I have no idea why when the plane is flat and the sphere is rolling along it towards the arch using AddForce it passes straight through the arch.

Thanks in advance.

 

While trying to put together a couple videos demonstrating the issue I couldn't replicate things exactly. For the most part the sphere would pass through the colliders whether it was by using a script to add force or letting gravity do it. I had 4 or 5 different arches I had made in testing and one of them worked as I was hoping where the sphere always respected the colliders and didn't pass through. Don't know if it was simply from shutting down and restarting things or what. Anyway, for reference I was using 2019.3.7f1.

Thanks for responding anyway. Im just going to go with what I have now which seems to be working ok.​