Moving the crate

So I started building to today. The idea is to start with a sandbox level that can be used to test al of the game mechanics. I started in the crate that should have physics behavior but almost immediately ran into a problem.

You easily create a physics object by adding a static mesh as a Rigid body. A rigid body can be moved with the physics gun, or by shooting at it. The problem is that it can't be moved by walking at it. There also seem to be no settings in the object properties that changes that specific behavior.

Trying to look for a solution now.