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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Colliding Carts

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Express an understanding of the design of the two experiments.

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Analyze Experiment 2 data (perfectly elastic collisions) to determine general patterns.

An investigation of hit-and-stick and perfectly elastic collisions.

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Analyze both Experiment 1 and Experiment 2 to determine patterns associated with the two types of collisions.

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Analyze Experiment 1 data (hit-and-stick collisions) to determine general patterns.

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Colliding Carts A group of physics students are investigating the effect of the mass of two colliding carts upon their post-collision velocities. Being vectors, the velocities can be positive (for moving rightward) or negative (for moving leftward). Experiment 1 In Experiment 1, Cart B is at rest on the track. They push Cart A towards it. The carts are equipped with Velcro strips so they stick together when they collide. The two carts collide and move with the same speed after the collision. A motion detector is used to determine the before- and after-collision velocity of Cart A. For subsequent trials, the mass of the carts are varied by adding bricks to them. Their data is shown in Table 1. Experiment 2 In Experiment 2, the carts have embedded magnets that repel each other before contact is made. Cart B is at rest on the track and Cart A is in motion. After the collision, the carts move at separate velocities. Several trials are conducted using different mass combinations. Their data is shown in Table 2.

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Physics-Interactives/Static-Electricity/

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