anchor.diff:  
   You can make Spatials that are not dynamic: Switch the RigidBodyControl to setKinematic(true) to have it move along with its Spatial.
   
  -*  A kinematic is unaffected by forces or gravity, which means it can float in mid-air and cannot be pushed away by dynamic “cannon balls etc.
  +*  A kinematic is unaffected by forces or gravity, which means it can float in mid-air and cannot be pushed away by dynamic "`cannon`" balls etc.
   *  A kinematic RigidBody has a mass.
   *  A kinematic can be moved and can exert forces on dynamic RigidBodys. This means you can use a kinematic node as a billiard cue or a remote-controlled battering ram.
   
  
positive.code: 
  === Geometries
  
  In this “shoot at the wall example, you use Geometries such as cannon balls and bricks. Geometries contain meshes, such as Shapes. Let's create and initialize some Shapes: Boxes and Spheres.
  
  [source,java]
  ----
  
negative.code: :keywords: beginner, intro, physics, documentation, input, model, control
  
  
  Do you remember the xref:beginner/hello_collision.adoc[Hello Collision] tutorial where you made the model of a town solid and walked through it in a first-person perspective? Then you may remember that, for the simulation of physical forces, jME3 integrates the link:http://jbullet.advel.cz/[jBullet] library.
  
  Apart from making models "`solid`", the most common use cases for physics in 3D games are:
  
  *  Driving vehicles with suspensions, tyre friction, ramp jumping, drifting – Example: car racers
  *  Rolling and bouncing balls – Example: pong, pool billiard, bowling
  *  Sliding and falling boxes – Example: Breakout, Arkanoid
  *  Exposing objects to forces and gravity – Example: spaceships or zero-g flight
  *  Animating ragdolls – Example: "`realistic`" character simulations
  *  Swinging pendulums, rope bridges, flexible chains, and much more…
  
  All these physical properties can be simulated in JME3. Let's have a look at a simulation of physical forces in this example where you shoot cannon balls at a brick wall.
  