Reporting Category: Motion and Forces Standard: 2.2 - Interpret and provide examples of how energy can be converted from gravitational potential energy to kinetic energy and vice versa.

The diagram below shows three points on a roller coaster track. A car starts from rest at point X and travels along the track. Assume friction is negligible.

Identify whether the car’s gravitational potential energy increases, decreases, or stays the same as the car moves from point X to point Y.

Identify whether the car’s kinetic energy increases, decreases, or stays the same as the car moves from point Y to point Z.

The car has a mass of 600 kg.

Calculate the gravitational potential energy of the car at its maximum height. Show your calculations and include units in your answer.

Calculate the maximum kinetic energy of the car. Show your calculations and include units in your answer.

Scoring Guide and Sample Student Work Select a score point in the table below to view the sample student response.

The response demonstrates a thorough understanding of how energy can be converted from gravitational potential energy to kinetic energy and vice versa. The response correctly identifies whether the car’s gravitational potential energy and kinetic energy increase, decrease, or stay the same. The response also correctly calculates the gravitational potential energy of the car at its greatest height and the maximum kinetic energy of the car.