Difference between revisions of "PhET/C2/Energy-Skate-park/English-timed"

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Select '''Double Well''' track from '''Tracks''' menu and observe the energy changes.  
 
Select '''Double Well''' track from '''Tracks''' menu and observe the energy changes.  
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||And give an explanation. (Hint-Right click on the '''Track''' and select '''Roller Coaster Mode''')  
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|| In this tutorial we have demonstrated, How to use '''Energy Skate Park''', '''PhET simulation'''.  
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|| In this tutorial, we have demonstrated, How to use '''Energy Skate Park''', '''PhET simulation'''.  
  
 
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|| 13:29
 
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|| The video at the following link summarizes the Spoken Tutorial project.  
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|| The video at the following link summarizes the '''Spoken Tutorial''' project.  
  
 
Please download and watch it.  
 
Please download and watch it.  
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|| 13:38
 
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|| The Spoken Tutorial Project team: conducts workshops using spoken tutorials and  
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|| The '''Spoken Tutorial''' Project team conducts workshops using spoken tutorials and  
  
 
gives certificates on passing online tests.  
 
gives certificates on passing online tests.  
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|| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.  
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|| Spoken Tutorial Project is funded by '''NMEICT, MHRD,''' Government of India.  
  
 
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|| This is Meenal Ghoderao from IIT-Bombay.  
 
|| This is Meenal Ghoderao from IIT-Bombay.  
  
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Thank you for joining  
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Thank you for joining.
 
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Latest revision as of 16:19, 11 August 2018

Time Narration
00:01 Welcome to this tutorial on Energy Skate Park simulation.
00:06 In this tutorial, We will demonstrate Energy Skate Park, PhET simulation.
00:14 Here I am using-

Ubuntu Linux OS version 14.04

00:22 Java version 1.7.0
00:26 Firefox Web Browser version 53.02.2
00:32 To follow this tutorial, learner should be familiar with topics in high school physics.
00:40 Using this simulation, we will learn:

1. About law of conservation of energy.

00:48 2. To show pie chart and bar graphs for energy changes.
00:53 3. To use Energy vs Position graph, to show the energy value at a particular position.
01:00 4. To change location and observe the energy changes.
01:04 5. About change in energy due to change in mass and friction.
01:09 According to law of conservation of energy, energy can neither be created nor destroyed.
01:17 It can only be converted from one form to another.
01:22 The total energy before and after the transformation is conserved.
01:27 Potential energy is the energy possessed by an object by virtue of its position.
01:34 PE = mgh where m is mass of the object , g is acceleration due to gravity and h is height.
01:43 Kinetic energy is the energy possessed by a body due to its motion.
01:49 KE =1/2 mv2

where m is mass of object and v is velocity.

01:57 Let us start the demonstration.
02:00 Use the given link to download the simulation.
02:04 I have already downloaded Energy skate park simulation to my Downloads folder.
02:11 To run the simulation, open the terminal.
02:15 At the prompt, type: cd Downloads and press Enter.
02:23 Then type: java space hyphen jar space energy hyphen skate hyphen park underscore en dot jar and press Enter.
02:37 Energy Skate Park simulation opens.
02:41 This is the interface of Energy skate Park simulation.
02:46 Using this simulation, let's see how energy transformations happen in real world applications.
02:54 Screen has a menu bar with menu items- File,
03:00 Tracks,
03:02 Help.
03:04 Screen has a PhET skater oscillating in a default loop.
03:09 To change the track of the skater, click on Tracks menu.
03:14 Menu shows a list of tracks to choose.
03:19 On the right side, there is a panel with controls.
03:24 These controls are used to change the attributes in the simulation.
03:29 Click on Reset to reset the simulation. Click on Yes to confirm the reset.
03:37 Click on Choose Skater button on the panel.
03:41 Choose Skater panel opens.
03:44 This panel shows different skaters along with their mass.
03:49 By default, PhET Skater with 75 kg mass is selected.
03:55 Click on OK button.
03:58 At the bottom of the screen, we have Sim Speed slider to control the speed of the animation,
04:06 Play/Pause and Step buttons,
04:10 Zoom in and zoom out buttons.
04:13 By default, Sim Speed slider is on fast.
04:17 Drag the Sim speed slider between slow and fast.
04:22 To show the path, click on Show Path button in Path section.
04:27 Observe the purple dots on the track.
04:30 Click on Stop button and then pause the simulation.
04:36 Click on any purple dot on the track.
04:40 The following information will be displayed:
04:44 Kinetic energy,
04:46 Potential energy,
04:48 Total energy,
04:50 Height,
04:52 Speed of skater.
04:54 Click on Clear button to clear the path.
04:58 Now, click on Play button to play the simulation.
05:02 On the right side panel, under Energy Graphs section, click Show Pie Chart check-box.
05:09 Observe that with Thermal check-box also gets selected.
05:14 Pie chart shows conversion of kinetic energy to potential energy and vice-versa.
05:20 Energy indicator box is shown on the top right corner of the screen.
05:26 This box helps to identify the energy changes in the Pie Chart.
05:31 In this case, potential energy is gravitational potential energy.
05:36 It is due to change in height of the skater in the gravitational field.
05:41 As the skater moves downwards, his potential energy decreases and kinetic energy increases.
05:49 As skater moves upwards his potential energy increases and kinetic energy decreases.
05:56 Drag the sim speed slider towards Slow.
06:00 You can still see a small amount of potential energy at the bottom of the track.
06:06 This is because track is at a height above the ground level.
06:11 Drag the track to the ground level.
06:15 Observe that skater has zero potential energy at the bottom of the track and zero kinetic energy at the top.
06:23 Now I will drag the track above the ground level.
06:27 Click on Potential Energy Reference check-box.
06:31 P.E=0 at this dotted line will display at the bottom of the screen.
06:37 Drag Potential Energy Reference line upwards to touch the bottom of the track.
06:43 Observe that now skater has zero potential energy at the bottom of the track.
06:49 Next, click on Bar Graph button.
06:52 A bar graph with four energies is shown.
06:56 Note the energy changes as the skater moves back and forth on the track.
07:02 Here total energy of the skater remains constant.
07:06 Therefore it obeys the law of conservation of energy.
07:10 Let us change the shape and height of the track.
07:14 Click on any blue point and drag.
07:17 Note the increase in Total energy with an increase in height of the track.
07:22 Close the Bar Graph.
07:24 Click on Reset button to reset the simulation.
07:29 Next click on Energy vs. Position button.
07:33 Energy vs Position graph will display.
07:37 Drag the track to the left side to view the graph and skater simultaneously.
07:43 Notice the energy changes with respect to position of skater.
07:48 Here you can see a moving dotted line.
07:52 It represents energy of the skater at a particular position on the track.
07:58 Graph has four energy check-boxes at the bottom.
08:02 To view the graph of any specific energy, un-check remaining check boxes.
08:09 Click on Pause button to pause the simulation.
08:13 Click on Copy button.
08:16 Copy button helps to show the energy values at particular position on the graph.
08:22 Close the graphs.
08:25 Now click on Energy vs. Time button.
08:29 Energy vs. Time graph opens.
08:33 At the bottom of the graph, we have- Sim Speed slider,
08:38 Stop/Go, Playback,
08:42 Step, Rewind and Clear buttons.
08:49 Click on Play button to play the simulation.
08:56 Click on Stop button.
08:59 Lets drag the sim speed slider between slow and fast.
09:04 Then click on Playback button.
09:07 Notice a violet vertical line moving across the path.
09:12 Note the kinetic, Potential and Total energy values at a given time.
09:20 Note that Total energy remains constant.
09:24 But, kinetic energy changes to potential energy and vice-versa.
09:29 Here Thermal energy is zero as there is no friction.
09:33 Close the Energy vs. Time graph.
09:36 Click on Reset button to reset the simulation.
09:40 Let us see how mass of the skater will affect the total energy.
09:45 Scroll to the bottom of the panel.
09:48 Click on Edit skater button.
09:51 Scroll down to see Mass text-box and Mass Slider.
09:57 By default, Mass is 75 kg.
10:01 Click on Energy Vs. Time button to open the graph.
10:06 Drag the Mass slider gradually towards 200.
10:10 Observe the change in energy as we change the skater's mass in the graph.
10:16 Close the Energy Vs. Time graph.
10:19 Now we will take the skater to different planets.
10:24 Scroll up the panel.
10:27 Click on Reset button to reset the simulation.
10:31 In the Location section, by default, Earth is selected.
10:35 Click on Energy vs. Time button.
10:39 Under Location section, click on Moon radio-button.
10:44 Observe that Skater flies off because moon has low Gravity value.
10:50 Click on Return Skater button.
10:53 Here Gravity value is 1.62 N/kg which is less than that of Earth.
11:00 This results in decrease in the speed of skater.
11:04 Here, Total energy decreases as gravity on Moon is less than that of Earth.
11:10 Similarly, explore Jupiter and Space locations and compare the energy changes.
11:17 Close the Energy vs. Time graph.
11:21 Let us study the energy distribution for tracks with and without friction.
11:26 Click on Reset button to reset the simulation.
11:30 Scroll down to panel and click on Track Friction button.
11:35 Scroll down to see Coefficient of Friction slider.
11:40 Click on Energy vs.Time button.
11:44 Drag the Coefficient of Friction slider gradually from None to Lots.
11:50 Observe the energy changes.
11:53 Here, part of energy is converted to Thermal energy due to friction.
11:59 This is due to the resistance in motion caused by friction.
12:04 Friction opposes the motion of the skater.
12:08 It causes him to lose energy and slow down.
12:12 Close the Energy vs. Time graph.
12:15 As an assignment:

Select Double Well track from Tracks menu and observe the energy changes.

12:24 Compare the energy changes in Double well track with Double Well Roller Coaster Mode.
12:30 Find the changes in the thermal energy
12:34 and give an explanation. (Hint-Right click on the Track and select Roller Coaster Mode).
12:43 Using Tracks box, create tracks and observe the change in energies.
12:49 Let us summarise.
12:52 In this tutorial, we have demonstrated, How to use Energy Skate Park, PhET simulation.
13:01 Using this simulation we have learnt,

1. About law of conservation of energy.

13:08 2. To show pie chart and bar graphs for energy changes.
13:13 3. To use Energy vs Position graph to show the energy value at a particular position.
13:20 4. To change location and observe the energy changes.
13:24 5. About change in energy due to change in mass and friction.
13:29 The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

13:38 The Spoken Tutorial Project team conducts workshops using spoken tutorials and

gives certificates on passing online tests.

13:47 For more details, please write to us.
13:51 Please post your timed queries on this forum.
13:55 This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.
14:03 Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.
14:11 More information on this mission is available at this link.
14:16 This is Meenal Ghoderao from IIT-Bombay.

Thank you for joining.

Contributors and Content Editors

Madhurig, PoojaMoolya, Sandhya.np14

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