This week you will be working with simulations to prepare you for analyzing your real experiment next week!

Submitting this week:

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Screenshots of PhET simulation when the skater is at the middle and bottom of the ramp with friction and without friction. Should be a total of 4 screenshots!
Observations from the PhET simulation.
Screenshot of oPhysics simulation after traveling a short distance.
Calculation of energy for the case with friction.

Objective 1: Using the PhET simulation, you will see what happens to energy for an object sliding down a ramp.

Start by going to the Energy Skate Park
(Links to an external site.)
PhET simulation and setting up the skater as shown in the screenshot below. Be sure all boxes are checked, the friction is set to “None”, and you have the skater paused at the top of the ramp. Yours should look exactly like the diagram below!


Observations: Report what you observe when the skater reaches the halfway point down the ramp and at the very bottom. (What is happening in the bar graph/pie chart as well as the speedometer?) What is your prediction of the models/graphs if we add friction? Explain your hypothesis and then try it using the friction slider. Please include a screenshot at the middle and bottom of the ramp.


Objective 2: Using the oPhysics simulation, you will calculate and check what happens to energy for an object sliding down a ramp.

Start by going to the oPhysics
(Links to an external site.)
website. Please set your coefficient of static friction (μs) and your initial velocity to zero!


Calculate the PE and KE at top of the hill and at bottom of the hill using trigonometry when needed and include a picture of your calculation in your report. Include a screenshot of your setup when the object is at the bottom of the ramp. Is the total energy the same at the beginning as it is at the end? What is the percent difference? Please show your calculations!
Let’s consider friction now: Run this simulation again with μk > 0. Set the value for μk that is similar to the value you found from your Lab 4 (Part 2) (which should have been between 0.2-0.8). Is the total energy the same at the beginning as it is at the end? What is the percent difference in this case? Please show your calculations! Include a screenshot of your setup when the object is at the bottom of the ramp.
Looking at section 7.1 in your textbook (linked here!)
(Links to an external site.)
, please calculate the work done by friction. Explain: Is this related to total energy?

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