If you notice the first time it hit with screw at the top so had good distribution of force. The second time it was actually spinning, with the force directed from the side. I dont know how to calculate the exact force of its motion it ended up in but if in the classic pendulum motion it is 3x the normal force of gravity on the far side.jdiesel17 said:Actually I think that a light bulb (brand new out of the box) will pretty much always do that. If the lightbulb is new and has no scratches or imperfections you can get it to bounce back once. If it has been dropped once though the tiny scratches that are created from the first drop make it shatter the next time it has an impact.
A neat party trick that I heard once is take a new lightbulb and bet that you could toss it against a brick wall and then catch it without breaking. When the next person tries it, it should shatter on the second throw.