Today you'll be "seeing" the magnitude of forces acting on objects that are colliding. Before watching any of the videos you must make predictions as to which cart will experience the bigger force. The best way to express this is with free body diagrams.
For each situation you must draw a free body diagram for both carts during the collisions. So before you watch any videos, read the descriptions and make predictive FBDs.
Once you have your four sets of FBDs then download the videos and open them in Quick Time. Use the arrow keys to go through the videos frame by frame and observe the forces.
Find the videos at: http://fnoschese.posterous.com/
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