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The Car works by having the mouse trap on top on the base of the car. We then attach a pulley into the mouse trap in order to hold the bronze piece in place in motion with the pulley. Tape and zip ties are used to keep it together so it does not fall apart. We then tie string to the top of the pulley (with Popsicle sticks) and to the back rod of the car by rotating it around it. When the pulley is held back, the string tightens, giving it potential energy. Once it is let go, it unwinds the string and transforms the potential energy into kinetic energy, moving the car forwards with friction slowing it down along the way.