# Potential vs Kinetic computer assignment.

Potential vs Kinetic computer assignment.

First we should review what we learned last class.

Go to: http://www.physicsclassroom.com/class/energy/Lesson-1/Potential-Energy and read and attempt to answer question 1 at the end.  Write these answers down — I might ask for them later.

Also review http://www.physicsclassroom.com/class/energy/Lesson-1/Kinetic-Energy and answer questions 1, 2, and 4, and write these down too.

OK!  Now that the review is done you can move on to the fun part!

Go to the PhET Energy Skate Park Basics Simulation here: https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html

Click on “Intro”  and click on the bar graph.  Begin setting your skater in different positions and letting her go!

INTRO

1. What happens to the total energy when you set the skater higher or lower?
2. Click on “Grid” Try setting the skater at 4 and let her go back and forth 5 times.
1. Did she slow down or lose total energy?
2. Why or why not?
3. What happens when you increase the mass of the skater?
4. What happens when you decrease the mass of the skater?
5. Try pausing the skater at the lowest point.
1. What is the KE ?
2. What is the KP ?
6. Try pausing the skater at the highest point.
1. What is the KE ?
2. What is the KP ?
7. Why does the total energy not change for the skater while she is skating? Use this to explain the relationship between Kinetic, Potential, and Total Energy

FRICTION

Next click on the “Friction” simulation at the bottom. Click on the “bar graph” and “grid” checkboxes.  Begin setting your skater in different positions and letting her go!

1. What happens to the total energy when you set the skater higher or lower?
2. Try setting the skater at 4 on the grid and let her go back and forth 5 times.
1. Did she slow down or lose total energy?
2. Why or why not?
3. Try this again by setting the friction to “lots” or “none”
3. What happens to the “friction” on the bar graph over time?
4. What happens when you increase the mass of the skater?
1. Does the friction bar increase more or less quickly?
5. What happens when you decrease the mass of the skater?
1. Does the friction bar increase more or less quickly?
6. Why does the total energy not change for the skater while she is skating? Use this to explain the relationship between Kinetic, Potential, Friction, and Total Energy

PLAYGROUND

Click on the PLAYGROUND simulation.  Make sure you have your bar graph of energy showing and the gridlines clicked on.  Now click the button that releases the skater from the ramp.

Your challenge is to create a ramp that can safely complete a full loop.

What did you have to do to create the loop?