Conservation of Energy s2

IP 614

Name: ______Block: ______Date:____/____/______

Conservation of Energy

Big Idea: The sum of the kinetic energy and potential energy remains the same in the absence of work or friction.

Pre-Lab Activity: Run the PHET simulation called: Energy Skate Park: http://phet.colorado.edu/en/simulation/energy-skate-park. Play around with the simulation and answer the following questions related to simulation. (**Make sure you re-set the PE horizontal line to the bottom of the ramp)

1. Use the bar graph to find the positions where the skater experiences maximum kinetic energy (KE), maximum potential energy (GPE), and where KE = GPE.

2. Click on the Pie Chart box and run your skater through the track again. Com- pare what happens to KE and GPE as the skater moves along the track. What general statement can you make about the relationship between KE and GPE?

3. Turn on the Track Friction and change the coefficient of friction on the track. Describe how friction relates to thermal energy and work.

4. Change the condition again after reset so your system is no longer “isolated.” Describe what changes you did to make the system no longer “isolated.” Explain how conservation of energy can/cannot be applied to your new system.

Small Group Activity: IP 614

Task: Create a presentation of conservation of energy for an extreme sport or activity (such as amusement park rides). Assume that there is no additional work or friction in the system. Energy is either in the form of potential energy or kinetic energy and total mechanical energy remains constant. (In some extreme sports/activities, there might be more than one potential energy: Elastic Potential Energy & Gravitational Potential Energy).

Extreme Sport/Activity: ______

Team Members:

Team Leader______Responsible for filling out this page (leading discussions within small groups), assigning roles, and directing the preparation of the illustrations and chart. In addition, he/she is responsible for filling out the Group Self-Evaluation Form.

Team Artist ______Responsible for drawing the main illustrations of the activity on a large presentation paper. Request help from teammates for ideas and artwork.

Lead Scientist______Responsible for creating and presenting charts of KE, GPE, (EPE), total ME for 4-5 locations on the main illustration. Leading research and calculation that shows a reasonable amount of total mechanical energy for that activity.

Procedure:  Choose group roles.  Choose one extreme sport/activity that will incorporate energy transfer. If you need ideas, discuss possibilities with your teacher.  Research one video that shows the activity that you will use for the commentary potion of the presentation. Make sure you include the following vocabulary in the commentary: kinetic energy, gravitation potential energy, conservation of energy, conservation of mechanical energy, work, and friction, (elastic potential energy).  Make large picture and smaller charts of GPE, KE, (EPE), and ME for 4-5 locations on smaller construction paper.  Calculate the amount of total mechanical energy at the beginning of the activity and show the calculation on the large presentation paper with the drawings. (This quantitative analysis should be reasonable numbers. i.e. you might have to do some quick research into height, masses, velocity of the objects in your activity for your calculation to be realistic.)  Present to class tomorrow—begin with the video, provide running commentary. Then explain the details with the large picture and smaller graphs you constructed.  Group leader fills out Group Self-Evaluation Form and hands in. IP 614

Group Self-Evaluation Form (to be completed by Team Leader and handed in at end of class)

Team Leader: ______Team Artist: ______Lead Scientist: ______Presenter: ______

Extreme Sport: ______

Give your group a rating of 1-5 on how well it performed each task. (1 = poor, 2 = needs work, 3 = acceptable, 4 = good, 5 = awesome)

______Group quickly chose roles for each member of the team.

______Group treated all member of the team respectfully.

______Group encouraged creative and diverse ideas from each member.

______Group stayed on task, not distracted by socializing or other events.

______Group finished task efficiently and on time.

Comment on group’s performance and suggestion ideas for improvement.