Unity3d Gravity issue .Sphere passing through the board

Question

I am making "Marble-board" game using Unity3d with mono-develop(c#).i want to make marbles rolling using gravity.But marble is passing through the board ,when i apply gravity to it.please help to solve my problem

For more specification, Rigidbody Component of Sphere: Use Gravity : true Is Kinematic :false

Answer 1

Generally, Rigibody is needed for physics - ie. the sphere should have a rigidbody if you want to use a built-in Unity's gravity. The ground should only have a collider ↓

All objects need Colliders to be able to detect collision. Make sure both objects have Colliders and the isTriggered is false (unless you handle collisions with scripts).

So, in a simple setup like this

The Planes properties:

And the Sphere's properties:

So when the Sphere drops onto the Plane it does not go through.