Nancyvarkey: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Energy Skate Park simulation'''. |- ||00:06 || In this tutorial, We will demonstra..."

2022-08-12T10:12:33Z

Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Energy Skate Park simulation'''. |- ||00:06 || In this tutorial, We will demonstra..."

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{|border=1
||'''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'''.

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||00:14
|| Here I am using-

'''Ubuntu Linux OS''' version 14.04

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||00:22
||'''Java''' version 1.7.0

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||00:26
||'''Firefox Web Browser''' version 53.02.2

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||00:32
|| To follow this tutorial, learner should be familiar with topics in high school physics.

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|| 00:40
|| Using this '''simulation''', we will learn:

1. About law of conservation of energy.

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||00:48
||2. To show '''pie chart''' and '''bar graph'''s for energy changes.

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||00:53
||3. To use '''Energy vs Position''' graph, to show the energy value at a particular position.

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||01:00
||4. To change location and observe the energy changes.

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||01:04
||5. About change in energy due to change in mass and friction.

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||01:09
|| According to law of conservation of energy, energy can neither be created nor destroyed.

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||01:17
||It can only be converted from one form to another.

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||01:22
||The total energy before and after the transformation is conserved.

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|| 01:27
||'''Potential energy''' is the energy possessed by an object by virtue of its position.

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||01:34
||'''PE = mgh ''' where '''m''' is mass of the object , '''g''' is acceleration due to gravity and '''h''' is height.

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||01:43
||'''Kinetic energy''' is the energy possessed by a body due to its motion.

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||01:49
||'''KE =1/2 mv<sup>2</sup> '''

where '''m''' is mass of object and '''v''' is velocity.

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|| 01:57
|| Let us start the demonstration.

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|| 02:00
|| Use the given link to download the '''simulation'''.

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|| 02:04
|| I have already downloaded '''Energy skate park simulation '''to my '''Downloads '''folder.

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|| 02:11
|| To '''run''' the '''simulation''', open the '''terminal'''.

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||02:15
||At the prompt, type: '''cd Downloads''' and press '''Enter'''.

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|| 02:23
|| Then type: '''java space hyphen jar space energy hyphen skate hyphen park underscore en dot jar''' and press '''Enter'''.

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||02:37
||'''Energy Skate Park simulation''' opens.

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|| 02:41
|| This is the '''interface''' of '''Energy skate Park simulation'''.

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|| 02:46
|| Using this '''simulation''', let's see how energy transformations happen in real world applications.

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|| 02:54
|| '''Screen''' has a menu bar with menu items- '''File''',

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||03:00
||'''Tracks''',

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||03:02
||'''Help'''.

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|| 03:04
|| Screen has a '''PhET skater''' oscillating in a default '''loop'''.

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||03:09
||To change the track of the '''skater''', click on '''Tracks''' menu.

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||03:14
||Menu shows a list of '''tracks''' to choose.

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|| 03:19
|| On the right side, there is a '''panel''' with '''control'''s.

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||03:24
||These controls are used to change the attributes in the '''simulation'''.

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|| 03:29
|| Click on '''Reset''' to reset the simulation. Click on '''Yes''' to confirm the reset.
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|| 03:37
|| Click on '''Choose Skater''' button on the panel.

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||03:41
||'''Choose Skater''' panel opens.

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|| 03:44
|| This panel shows different '''skaters''' along with their mass.

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||03:49
||By default, '''PhET Skater''' with 75 kg mass is selected.

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||03:55
||Click on '''OK''' button.

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|| 03:58
|| At the bottom of the screen, we have '''Sim Speed''' slider to control the speed of the '''animation''',

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||04:06
||'''Play/Pause''' and '''Step''' buttons,

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||04:10
||'''Zoom in''' and '''zoom out''' buttons.

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|| 04:13
|| By default, '''Sim Speed''' slider is on '''fast'''.

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||04:17
||Drag the''' Sim speed''' slider between '''slow '''and '''fast'''.

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|| 04:22
|| To show the path, click on '''Show Path''' button in '''Path''' section.

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||04:27
||Observe the purple dots on the '''track'''.

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||04:30
||Click on '''Stop''' button and then pause the '''simulation'''.

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|| 04:36
|| Click on any purple dot on the track.

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||04:40
||The following information will be displayed:

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||04:44
||'''Kinetic energy''',

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||04:46
||'''Potential energy''',

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||04:48
||'''Total energy''',

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||04:50
||'''Height''',

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||04:52
||'''Speed''' of skater.

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||04:54
|| Click on '''Clear''' button to clear the path.

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|| 04:58
|| Now, click on '''Play''' button to play the '''simulation'''.

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|| 05:02
|| On the right side panel, under '''Energy Graphs''' section, click '''Show Pie Chart''' check-box.

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|| 05:09
|| Observe that '''with Thermal''' check-box also gets selected.

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||05:14
||'''Pie chart''' shows conversion of kinetic energy to potential energy and vice-versa.

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|| 05:20
|| Energy indicator box is shown on the top right corner of the screen.

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||05:26
||This box helps to identify the energy changes in the '''Pie Chart'''.
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|| 05:31
|| In this case, potential energy is gravitational potential energy.

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||05:36
||It is due to change in height of the '''skater''' in the gravitational field.

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|| 05:41
|| As the '''skater''' moves downwards, his potential energy decreases and kinetic energy increases.

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|| 05:49
|| As '''skater''' moves upwards his potential energy increases and kinetic energy decreases.

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|| 05:56
|| Drag the '''sim speed''' slider towards '''Slow'''.

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|| 06:00
|| You can still see a small amount of potential energy at the bottom of the track.
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||06:06
||This is because track is at a height above the ground level.

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|| 06:11
|| Drag the track to the ground level.

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||06:15
||Observe that '''skater''' has zero potential energy at the bottom of the track and zero kinetic energy at the top.

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|| 06:23
|| Now I will drag the track above the ground level.

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||06:27
||Click on '''Potential Energy Reference''' check-box.

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||06:31
||'''P.E=0 at this dotted line''' will display at the bottom of the screen.
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|| 06:37
|| Drag '''Potential Energy Reference''' line upwards to touch the bottom of the track.

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||06:43
||Observe that now '''skater''' has zero potential energy at the bottom of the track.

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|| 06:49
|| Next, click on '''Bar Graph''' button.

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||06:52
||A bar graph with four energies is shown.

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||06:56
||Note the energy changes as the '''skater''' moves back and forth on the track.
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|| 07:02
|| Here total energy of the '''skater''' remains constant.

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||07:06
||Therefore it obeys the law of conservation of energy.
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|| 07:10
|| Let us change the shape and height of the track.

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||07:14
||Click on any blue point and drag.

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||07:17
||Note the increase in '''Total''' energy with an increase in height of the track.

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||07:22
||Close the '''Bar Graph'''.
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|| 07:24
|| Click on '''Reset''' button to reset the '''simulation'''.

|-
|| 07:29
|| Next click on '''Energy vs. Position''' button.

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||07:33
||'''Energy vs Position ''' graph will display.
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||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'''.

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||07:48
||Here you can see a moving dotted line.

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||07:52
||It represents energy of the '''skater''' at a particular position on the track.
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||07:58
|| Graph has four energy check-boxes at the bottom.

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||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.

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||08:16
||'''Copy''' button helps to show the energy values at particular position on the graph.

|-
||08:22
||Close the graphs.

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|| 08:25
|| Now click on '''Energy vs. Time''' button.

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||08:29
||'''Energy vs. Time''' graph opens.

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|| 08:33
|| At the bottom of the graph, we have- '''Sim Speed''' slider,

|-
||08:38
||'''Stop'''/'''Go''', '''Playback''',
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||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.

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|| 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.
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||10:39
|| Under '''Location''' section, click on '''Moon''' radio-button.

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||10:44
||Observe that '''Skater''' flies off because moon has low '''Gravity''' value.
|-
|| 10:50
|| Click on '''Return Skater''' button.

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|| 10:53
|| Here '''Gravity''' value is '''1.62 N/kg''' which is less than that of '''Earth'''.

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||11:00
||This results in decrease in the speed of '''skater'''.

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||11:04
||Here, '''Total energy''' decreases as gravity on Moon is less than that of Earth.

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||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.
|-
|}

PhET-Simulations-for-Physics/C2/Energy-Skate-Park/English-timed - Revision history

Nancyvarkey: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Energy Skate Park simulation'''. |- ||00:06 || In this tutorial, We will demonstra..."