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Placed sphere, added FPS script. Press play, fall through floor. ???
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floor and sphere must have a collider component. add rigidbody component to sphere + check gravity flag. mesh collider against mesh collider will not work either.
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go to sphere, components, physics, rigidbody, check "use gravity" and it should work. also, try what "joe" and "adam" said those were good answers also.
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Do you have gravity applied to it? and is there a collider on the object?
If part of the sphere's collider is below the floor's collider, it won't collide properly either.