What are the physics in bowling?

My 6th graders will be learning that next week. Ideas from last year's class:

• Friction, as the ball travels down the lane. Both rolling and sliding friction can have an effect.
• Momentum: it is conserved, because the total momentum / force on the pins is what we started with minus the friction (and the bounces!)
• Velocity and acceleration
• Gravity (you do have to lift the ball)
• Rotation, though we can't do that math

** If you look online they actually have videos (youtube) and programs that calculate the revolutions of the bowling ball per second. There are methods but it might be a little too much for 6th graders.
From a bowlers standpoint, one of the most important things to notice is how long the ball skids and where it starts to hit friction on the lane.
The other bullets are right, but there are also factors such as the core of the bowling ball (theyre all designed today to roll a certain way, and is typically noticable in the higher end bowling balls rather than the ones you pick up off a rack.
The finger layout in relation to the core affects how the ball rolls.
The ball position and speed throughout the delivery. At the top point of the backswing the ball is actually suspended in mid air if your foot timing is perfectly synchonized to your armswing.
For a more advanced bowler, there are thigns such as leverage, tradjectory, pocket entry angles, levers, pendulums, etc..
Too much to explain in a small paragraph. Id suggest looking at bowlingknowledge.info if you are truly interested.