Introduction to Energy Skate Park Lab Starter : At what points on the path of a swinging child is her speed a maximum? A minimum? How does this relate to the height of the child above the ground? Starter : At what points on the path of a swinging child is her speed a maximum? A minimum? How does this relate to the height of the child above the ground?

Practice/ Application Open the Energy Skate Park Basics at the phet site. In the Introduction tab, pick the first track (U shaped.) Check bar graph, speed, grid and slow motion. Place the skater at 4m above the ground on the track and release. Open the Energy Skate Park Basics at the phet site. In the Introduction tab, pick the first track (U shaped.) Check bar graph, speed, grid and slow motion. Place the skater at 4m above the ground on the track and release.

Data Put in Science Notebook Read and record the velocity at the following heights. Each increment on the speed dial is 1.0m/s

Questions - Put in Science Notebook 1.Describe how the kinetic energy and the potential energy are related by observing the bar graph. a. What can you tell about the sum of KE and PE? b. When the KE is a maximum, what is the PE? c. How is the KE related to the velocity? d. How is the PE related to the height? 2. At what height are the potential energy and the kinetic energy equal? 3.How are h and v related? Are they directly proportional? 4.Plot v 2 vs. h and do a best fit for the graph. What does this tell you about the relationship between h and v?

Exit In your science notebook, answer the following: 1. What are the factors that determine potential energy? 2. What are the factors that determine kinetic energy?

Science Notebook Checklist Starter Data table 3 Answered Questions Graph ( v 2 vs. h ) Summary Exit Starter Data table 3 Answered Questions Graph ( v 2 vs. h ) Summary Exit