The truck used for this experiment is an inexpensive battery operated truck obtained from Toys r Us. The trucks speed is varied by replacing a batter with a metal spacer. For AA cells spacers can be made from the appropriate size aluminum rod. Short wires with alligator clips could also be used. There are no unusual safety hazards for this lab.
Computer Set Up Connect the interface to the computer and connect the interface to a power supply.
Turn on the interface and the computer. Set the display to show two graphs. Make one a distance vs. time graph and the other a velocity vs. time graph. The computer will begin collecting data. Start the truck to produce the graph.