```Momentum Conserved          Savannah Walker               Mason School                              4712 Keeler Street                              Chicago IL 60623                              (312) 534-1530Objectives:

The students will apply two of Newton's Laws of Motion discovering that
Momentum is conserved.

Materials:

Carts
Planks with skates screwed to the bottom
"Crash Dummy Motorcycle"

Strategy:

Pull one ball out.  Ask "What will happen when I let go?"  Let everyone
contribute.  Then let go.  See what actually happens.  Do not get into a big
discussion at this point!  Come back to this at the end.

TWO CART COLLISION--
Define Momentum: Mass x Velocity.  Have two carts of equal mass collide with
each other from opposite directions.  Ask "What happened?"  Let everyone
contribute.  (Newton III, and Momentum is Conserved)
Then have the two carts collide when one of the carts is the same mass as
previously and the other has a third cart stacked on top-a larger mass.  Ask
"What happens?"  Let everyone contribute. (still Newton III, also Newton II,
Momentum is Conserved)

PLANK WITH ROLLER SKATES ATTACHED--
Have a student walk the plank.  Ask "What happened?"  (Plank goes the other
way.)  Let every student contribute.  Have students of different weights take
turns.  Observe any difference this makes.  (Newton III, Momentum is Conserved)

CRASH DUMMY MOTORCYCLE--
Construct a "Wall" at the end of an inclined plane.  Have the motorcycle with
the dummy rider crash into the wall.  Ask "What happened?"  (Newton III, also
Newton I, Momentum is Conserved)