2.  Use marble & steelie instead of plastic ball & bocce ball.  Make a track using meter sticks. You will only need 1 clamp. Clamp the 1“ block on top of the 2-meter stick track. You only need to clamp 1 end of the track.  Make motion in the direction of the clamp/block which will act as a stop.  Add a step b4 step 1. Make a statement about the relative mass of the marble & steelie.  Try trial where you vary speed. Don’t get too carried away.

3.  Purpose, data, conclusion  Purpose: to observe & analyze the collision of a marble & a steelie.  Data – an enumerated list of observations.  Conclusion – enumerate & answer the 2 analysis questions & the critical thinking question.

4.  To the equipment list - Add balance & change 2 meter sticks to 4.  Key to lab for each trial is to have the carts collide with the barrier simultaneously.  Initial P needs to be in the data table.  One of the 2 final momenta should be neg.  3 trials 1) empty/empty; 2) empty/loaded; loaded/loaded. Measure distance from back of carts.  What will be the units of P for this lab?  Use 1 st notch of the plunger. (shortest notch) (show them)  The carts do not necessary need to be in contact. (show them explain why – bc of unlevel table carts may want to roll.)

5.  Lab Report: Purpose; data table(s); Conclusion  Conclusion: 1. Derive the formula V 1 /V 2 = d 1 /d 2 2. In what units did you measure P in? 3. What statement can you make about the total P of the 2 carts b4 & after the explosion? 4. What is the total P 2 min. after the explosion? Is this observation consistent with above statement? Explain.