Algodoo

Sensor Tutorial:Hello!
Step 1: Add any objects
Step 2: Set a 1 object to unlimited density (In use as Glue to background it cannot remove linked sensor.)
Step 3: Set a another object to 1e-006 density
Step 4: Glue together
Step 5: Type script in sensor object in Oncollide: (e)=>{density = 0} OR (e)=>{e.this.density = 0}
Step 6: You can move by rescaling.