# B what happens to potential energy as the car goes up

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B.What happens to potential energy as the car goes up the hill?
3.Experiment: The kinetic energy(K) of a car describes its energy of motion. Click ResetSelect the Kvs t(kinetic energy vs. time) graph, and click PlayA.What happens to kinetic energy as the car goes down the hill?. .
B.What happens to kinetic energy as the car goes up the hill?
4.Compare: Click Reset. Set Hill 1to 80 cm, Hill 2to 60 cm, and Hill 3to 79 cm. Be sure the 50-g toy car is selected, and press Play. Sketch the Uvs t, Kvs t, and Evs tbelow.graphs 5.
Draw conclusions: How are potential energy, kinetic energy, and total energy related?
Gizmo Summary Questions1. What two things did you learn about how energy is transferred from completing this Gizmo lab? (Please use complete sentences.)
2. What happens to the to the levels of kinetic energy versus potential energy as the roller coaster moves through the track?
3. Where is kinetic energy at the highest? Lowest?
4. Where is potential energy at the highest? Lowest?
(Activity B continued on next page)Activity B (continued from previous page)6.Calculate: Gravitational potential energy (U) depends on three things: the object’s mass (m), its height (h), and gravitational acceleration (g), which is 9.81 m/s2on Earth’s surface:U= mghEnergy is measured in joules (J). One joule is equal to one 1 kg•m2/s2. When calculating the energy of an object, it is helpful to convert the mass and height to kilograms and meters. (Recall there are 1,000 grams in a kilogram and 100 centimeters in a meter.)A.What is the mass of the 50-gram car, in kilograms?
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