Karwanjehimanshi95 at 06:47, 10 October 2019

2019-10-10T06:47:54Z

Karwanjehimanshi95: Created page with "{| border=1 || '''Time''' || '''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Pendulum Lab simulation'''. |- || 00:06 || In this tutorial we will demon..."

2019-10-10T06:22:59Z

Created page with "{| border=1 || '''Time''' || '''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Pendulum Lab simulation'''. |- || 00:06 || In this tutorial we will demon..."

New page

{| border=1
|| '''Time'''
|| '''Narration'''

|-
|| 00:01
|| Welcome to the Spoken Tutorial on '''Pendulum Lab simulation'''.

|-
|| 00:06
|| In this tutorial we will demonstrate, '''Pendulum Lab PhET simulation'''.

|-
|| 00:13
|| Here I am using: Ubuntu Linux OS version 16.04

|-
|| 00:20
|| Java version 1.8.0

|-
|| 00:25
|| Firefox web browser version 62.0.3

|-
|| 00:31
|| To follow this tutorial,
Learner should be familiar with topics in high school physics.

|-
|| 00:38
|| Using this '''simulation''', we will, Describe simple harmonic motion.

|-
|| 00:44
|| Demonstrate the oscillations of a pendulum.

|-
|| 00:48
|| Investigate the factors that affect the oscillations of a pendulum.

|-
|| 00:54
|| Explain Conservation of energy during motion of the pendulum.

|-
|| 01:00
|| Demonstrate the oscillations for a pair of pendulums.

|-
|| 01:05
|| Demonstrate the oscillations of a pendulum on other celestial bodies.

|-
|| 01:11
||A simple pendulum has a fixed string attached to a bob.

|-
|| 01:17
|| Now we will define simple harmonic motion

Simple harmonic motion arises when the force on the oscillating body is directly proportional to its displacement from its mean position.

i.e.,

'''F α -x'''

|-
|| 01:38
|| In '''SHM '''there is a continuous interchange of kinetic and potential energies.

|-
|| 01:45
|| Here, mechanical energy is conserved.

|-
|| 01:49
|| Use the given link to download the''' simulation.'''

|-
|| 01:53
|| I have already downloaded the '''simulation''' to my '''Downloads''' folder.

|-
|| 01:58
|| Right click on '''pendulum-lab_en.html''' file.

|-
|| 02:02
|| Select the option '''Open with Firefox Web Browser'''.

|-
|| 02:07
|| '''Pendulum Lab simulation''' opens.

|-
|| 02:11
|| In the '''Pendulum lab simulation''', we have three screens

'''Intro'''

'''Energy '''

'''Lab'''

|-
|| 02:21
|| Click on '''Intro''' screen to open it.

|-
|| 02:25
|| In this screen we have,

A blue coloured pendulum.

|-
|| 02:30
|| A Protractor to show the changes in the angle of the pendulum.

|-
|| 02:35
|| A ruler to measure the distance from the fixed point to the centre of mass.

|-
|| 02:41
|| '''Length''' and '''Mass''' sliders to change the length and mass of the pendulum.

|-
|| 02:47
|| '''Gravity''' and '''Friction''' sliders to change gravity and friction.

|-
|| 02:53
|| At the bottom left corner of the screen we have grey coloured box.

|-
|| 02:58
||It has the following check boxes.

|-
|| 03:02
||A '''Ruler'''

A '''Stopwatch''' and

A '''Period Trace'''.

|-
|| 03:09
|| At the bottom of the screen we have, A '''Pendulum''' and a '''Pair of pendulum''' buttons.

|-
|| 03:16
|| '''Stop''' button to stop the oscillations of the pendulum.

|-
|| 03:21
|| '''Play/Pause''' and '''Step''' buttons.

|-
|| 03:25
|| '''Normal''' or '''Slow''' radio buttons to change animation speed.

|-
|| 03:30
|| And a '''Reset''' button to reset the '''simulation'''.

|-
|| 03:35
|| For the pendulum, reference line on the bob is the centre of mass.

|-
|| 03:41
|| Pendulum’s angle can be changed from 180 to -180 degrees.

|-
|| 03:47
|| Drag the pendulum to a particular angle say '''30 degrees''' and allow to oscillate.

|-
|| 03:55
|| Here, default length of pendulum is '''0.70 m'''.

|-
|| 04:01
|| Now click and drag the '''Length''' slider towards left till '''0.30 m'''.

|-
|| 04:08
|| Observe that as we decrease the length, pendulum oscillates faster.

|-
|| 04:14
|| Drag it back to '''0.70 m'''.

|-
|| 04:19
|| The default mass of pendulum is '''1 kg'''.

|-
|| 04:24
|| Click and drag the mass slider towards left till '''0.50 kg'''.

|-
|| 04:32
|| Observe that as we change the mass, it does not affect the oscillations of the pendulum.

|-
|| 04:39
|| Note that '''Friction''' slider is at '''None'''.

|-
|| 04:43
|| Now click and drag the '''Friction''' slider towards '''Lots'''.

|-
|| 04:48
|| Observe that the oscillations of the pendulum slow down.

|-
|| 04:53
|| After sometime pendulum stops oscillating.

|-
|| 04:57
|| This is due to increase in friction, as friction damps the oscillations of the pendulum.

|-
|| 05:04
|| Click on '''Reset''' button to reset the '''simulation'''.

|-
|| 05:09
|| Now let us measure time for 10 oscillations at different lengths.

|-
|| 05:16
|| We will make a tabular column, to show length and time for 10 oscillations of a pendulum.

|-
|| 05:24
|| Next select the '''Stop watch''' to record the time for 10 oscillations.

|-
|| 05:31
|| We will count 10 oscillations for length '''0.70 m'''.

|-
|| 05:37
|| Click and drag the pendulum at an angle of '''30 degrees''' to count number of oscillations.

|-
|| 05:44
|| Now we will count the 10 oscillations.

|-
|| 05:47
||one, two, three, four, five, six, seven, eight, nine, ten.

|-
|| 06:05
|| Note the value in the table.

|-
|| 06:09
|| To find the mean time taken for 10 oscillations, we need to measure the time for '''0.70 m''' again.

|-
|| 06:19
|| Click on '''Reset '''button of the '''Stop watch''' to take the count of next 10 oscillations.

|-
|| 06:26
|| Click on '''Stop '''button to stop the oscillations.

|-
|| 06:31
|| Change the length to '''0.60 m'''.

|-
|| 06:35
|| Follow the same steps to count 10 oscillations for length '''0.60 m'''.

|-
|| 06:43
|| Here I have already taken the observations for two different lengths.

|-
|| 06:49
|| As an assignment, Change the length of the pendulum to '''0.50 m''', '''0.40 m''' and '''0.30 m'''.

|-
|| 07:01
|| Count for 10 oscillations.

|-
|| 07:05
|| Note down the time.

|-
|| 07:08
|| Next we will move on to '''Energy''' screen.

|-
|| 07:12
|| Click on '''Energy''' screen button at the bottom of the interface.

|-
|| 07:18
|| In this screen we will explain how energy is conserved during the oscillations of the pendulum.

|-
|| 07:25
|| '''Energy''' screen has almost same tools as that for '''Intro''' screen except for the '''Energy Graph'''.

|-
|| 07:34
|| Click and drag the pendulum to '''60 degrees''' and allow it to oscillate.

|-
|| 07:40
|| Observe the graph.

|-
|| 07:42
|| From the drop down below '''Gravity''' select '''Jupiter'''.

|-
|| 07:47
|| Observe the change in graph.

|-
|| 07:50
|| Click on the '''Slow''' radio button to see the change in graph during the oscillations of the pendulum.

|-
|| 07:58
|| Here, we observe that at the extreme positions the potential energy is maximum.

|-
|| 08:05
|| At the mean position the kinetic energy is maximum.

|-
|| 08:10
|| Therefore, the total mechanical energy is conserved during the motion.

|-
|| 08:16
|| Click on the '''Normal''' radio button.

|-
|| 08:19
|| Now we will see the effect of friction in the graph.

|-
|| 08:23
|| Click and drag the '''Friction''' slider towards '''Lots'''.

|-
|| 08:28
|| Observe that due to increase in friction there is sudden increase in thermal energy.

|-
|| 08:35
|| After sometime total mechanical energy equals thermal energy.

|-
|| 08:41
|| This is because friction damps oscillations of the pendulum.

|-
|| 08:47
|| Now we will move to '''Lab''' screen.

|-
|| 08:50
|| In this screen we have the same tools that are included in previous screens.

|-
|| 08:57
|| Additionally we have '''velocity''' and '''Acceleration''' check boxes at the top left corner.

|-
|| 09:04
|| And '''Period Timer''' instead of '''Period Trace'''.

|-
|| 09:08
|| Select the pair of pendulums.

|-
|| 09:11
|| Here, we can see that on the top right corner, there are two lengths and two mass sliders.

|-
|| 09:19
|| The default length of second pendulum is '''1 m'''.

|-
|| 09:24
|| Default mass is '''0.50 kg'''.

|-
|| 09:29
|| Drag the blue pendulum to '''60 degrees''' and allow it to oscillate.

|-
|| 09:35
|| Similarly, drag the red pendulum.

|-
|| 09:40
|| Note that green colour is for '''Velocity''' vector.

|-
|| 09:44
|| And yellow is for '''Acceleration'''.

|-
|| 09:47
|| Select '''Velocity''' check box.

|-
|| 09:50
|| Select the '''Slow '''radio button to observe the velocity vector carefully.

|-
|| 09:56
|| Here, we observe that velocity is maximum at its mean position.

|-
|| 10:01
|| It decreases at the extreme positions.

|-
|| 10:06
|| This is due to maximum kinetic energy at the mean position.

|-
|| 10:12
|| Similarly, let us select '''Acceleration''' vector and observe the change in acceleration.

|-
|| 10:20
|| As an assignment,

Explain why acceleration is maximum at extreme positions?

|-
|| 10:29
|| Click on '''Reset '''button to reset the '''simulation.'''

|-
|| 10:34
|| Using the pendulum, we will compare calculated and measured Time period for different lengths.

|-
|| 10:42
|| Let us make a tabular column for

Length '''L''',

Time period '''T''' (Calculated) and

Time period '''T''' (Measured).

|-
|| 10:51
|| We can calculate the time period using formula

'''T=2π√(l/g)'''

|-
|| 11:00
|| Where '''‘l’''' is length and '''‘g’''' is acceleration due to gravity.

|-
|| 11:06
|| Value of '''g = 9.81 m/s^2'''.

|-
|| 11:13
|| Select '''Period Timer'''.

|-
|| 11:16
|| On the right side of the screen a '''Period Timer''' appears.

|-
|| 11:21
|| Note down '''0.70 m''' in the length column.

|-
|| 11:26
|| Here I have already calculated the time period using the formula.

|-
|| 11:32
|| We will measure the time period from the '''simulation'''.

|-
|| 11:38
|| Now click and drag the pendulum to '''40 degrees'''.

|-
|| 11:43
|| Click on the start button of the '''Period Timer'''.

|-
|| 11:47
|| Value for time period appears on the screen.

|-
|| 11:51
|| Note the time period in the measured column.

|-
|| 11:55
|| Now change the length to '''0.60 m'''.

|-
|| 12:00
|| Again click on the '''Period Timer'''.

|-
|| 12:06
|| Note the value in the table.

|-
|| 12:09
|| As an assignment,
Change the lengths of the pendulum to '''0.50 m''', '''0.40 m''', and '''0.30 m'''.

|-
|| 12:21
|| Note down the measured Time period.

|-
|| 12:24
||Calculate the time period using the formula.

|-
|| 12:27
|| Compare the calculated and measured time period values.

|-
|| 12:34
|| Next '''Reset '''the '''simulation'''.

|-
|| 12:37
|| Drag the pendulum to '''30 degrees''' to oscillate.

|-
|| 12:41
|| Note that acceleration due to gravity on Earth is 9.81 meter per second square.

|-
|| 12:49
|| Now select '''Jupiter''' from the drop down list.

|-
|| 12:53
|| Observe the change in oscillations of the pendulum.

|-
|| 12:58
|| Note that value of acceleration due to gravity on '''Jupiter''' is more than that on '''Earth.'''

|-
|| 13:07
|| As an assignment, Observe the oscillations on other celestial bodies.

|-
|| 13:14
|| Let us summarise

|-
|| 13:16
|| In this tutorial, we have demonstrated, How to use '''Pendulum lab PhET simulation'''.

|-
|| 13:24
|| Using this '''simulation''', we have, Described simple harmonic motion.

|-
|| 13:30
|| Demonstrated oscillations of a pendulum.

|-
|| 13:34
|| Investigated the factors that affect the oscillations of a pendulum.

|-
|| 13:40
|| Demonstrated how energy is conserved during oscillations.

|-
|| 13:45
|| Demonstrated the oscillations of a pair of pendulums.

|-
|| 13:50
|| Observed the oscillations on other celestial bodies.

|-
|| 13:55
|| The video at the following link summarizes the Spoken Tutorial project.

|-
|| 14:01
|| Please download and watch it.

|-
|| 14:04
|| The '''Spoken Tutorial Project''' team, conducts workshops using spoken tutorials and

gives certificates on passing online tests.

|-
|| 14:14
|| For more details, please write to us.

|-
|| 14:18
|| Please post your timed queries in this forum.

|-
|| 14:22
|| This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.

|-
|| 14:30
|| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

|-
|| 14:37
|| More information on this mission is available at this link.

|-
|| 14:42
|| This is Himanshi Karwanje from IIT-Bombay.

|-
|| 14:46
|| Thank you for joining.
|-
|}

@@ Line 25: / Line 25: @@
 |-
 || 00:31
-|| To follow this tutorial,
+|| To follow this tutorial, Learner should be familiar with topics in high school physics.
 Learner should be familiar with topics in high school physics.
 |-
@@ Line 58: / Line 57: @@
 |-
 || 01:17
-|| Now we will define simple harmonic motion
+|| Now we will define simple harmonic motion.
-Simple harmonic motion arises when the force on the oscillating body is directly proportional to its displacement from its mean position.
+|-
-i.e.,
+|-
+|| 01:33
-'''F α -x'''
+|| That is '''F α -x''' .
 |-
@@ Line 96: / Line 97: @@
 |-
 || 02:11
-|| In the '''Pendulum lab simulation''', we have three screens
+|| In the '''Pendulum lab simulation''', we have three screens '''Intro''' ,'''Energy ''' ,'''Lab'''
-−
 '''Intro'''
-−
 '''Energy '''
-−
 '''Lab'''
 |-
@@ Line 110: / Line 105: @@
 |-
 || 02:25
-|| In this screen we have,
+|| In this screen we have, A blue coloured pendulum.
-−
 A blue coloured pendulum.
 |-
@@ Line 140: / Line 133: @@
 |-
 || 03:02
-||A '''Ruler'''
+||A '''Ruler''' ,A '''Stopwatch''' and A '''Period Trace'''.
-−
 A '''Stopwatch''' and
-−
 A '''Period Trace'''.
 |-
@@ Line 444: / Line 433: @@
 |-
 || 10:20
-|| As an assignment,
+|| As an assignment, Explain why acceleration is maximum at extreme positions?
-−
 Explain why acceleration is maximum at extreme positions?
 |-
@@ Line 458: / Line 445: @@
 |-
 || 10:42
-|| Let us make a tabular column for
+|| Let us make a tabular column for Length '''L''', Time period '''T''' (Calculated) and Time period '''T''' (Measured).
-−
 Length '''L''',
-−
 Time period '''T''' (Calculated) and
-−
 Time period '''T''' (Measured).
 |-
 || 10:51
-|| We can calculate the time period using formula
+|| We can calculate the time period using formula: '''T=2π√(l/g)'''
-−
 '''T=2π√(l/g)'''
 |-
@@ Line 530: / Line 509: @@
 |-
 || 12:09
-|| As an assignment,
+|| As an assignment, Change the lengths of the pendulum to '''0.50 m''', '''0.40 m''', and '''0.30 m'''.
- Change the lengths of the pendulum to '''0.50 m''', '''0.40 m''', and '''0.30 m'''.
 |-
@@ Line 615: / Line 593: @@
 |-
 || 14:04
-|| The '''Spoken Tutorial Project''' team, conducts workshops using spoken tutorials and
+|| The '''Spoken Tutorial Project''' team, conducts workshops using spoken tutorials and gives certificates on passing online tests.
-−
 gives certificates on passing online tests.
 |-

PhET/C3/Pendulum-Lab/English-timed - Revision history

Karwanjehimanshi95 at 06:47, 10 October 2019

Karwanjehimanshi95: Created page with "{| border=1 || '''Time''' || '''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Pendulum Lab simulation'''. |- || 00:06 || In this tutorial we will demon..."