PoojaMoolya: Created page with " {|border=1 || '''Time''' || '''Narration''' |- ||00:01 ||Welcome to this spoken tutorial on '''Simple Machines'''. |- ||00:05 ||In this tutorial we will learn to, |- ||00:0..."

2020-09-15T05:01:17Z

Created page with " {|border=1 || '''Time''' || '''Narration''' |- ||00:01 ||Welcome to this spoken tutorial on '''Simple Machines'''. |- ||00:05 ||In this tutorial we will learn to, |- ||00:0..."

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{|border=1
|| '''Time'''
|| '''Narration'''
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||00:01
||Welcome to this spoken tutorial on '''Simple Machines'''.

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||00:05
||In this tutorial we will learn to,

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||00:08
||Simulate the working of a pulley system.

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||00:11
||Calculate the necessary force to pull the load.

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||00:14
||Achieve a balance condition for the lever.

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||00:18
||Calculate the torque.

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||00:21
||Here I am using, Ubuntu Linux OS version 16.04

Firefox Web Browser version 62.0.3
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||00:33
||To follow this tutorial, learner should be familiar with topics in basic physics.

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||00:41
||First we will define a pulley.

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||00:44
||A pulley is a simple machine that is used to lift heavy objects.

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||00:49
||We can either use a single pulley or a combination of pulleys.

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||00:54
||For example pulleys can be used in wells, escalators, rock climbing, flag poles and others.
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||01:02
||Use the given link to download the '''Apps'''.

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||01:07
||I have already downloaded '''Apps on Physics '''to my '''Downloads''' folder.

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||01:12
||In this tutorial we will use, Pulley system and Lever Principle Apps.

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||01:19
||After downloading, '''html5phen''' folder appears in the '''Downloads '''folder.

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||01:25
||Double-click on '''html5phen''' folder.

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||01:29
||We see two folders namely '''ph''' and '''phen'''.

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||01:34
||Now double-click on the '''phen '''folder.

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||01:37
||In this folder, we see the '''Apps''' in '''java script ''' and '''htm '''format.
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||01:43
||We will use the Apps with '''htm file''' format.

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||01:47
||To open the Pulley system app, press '''Ctrl+F''' keys simultaneously.

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||01:54
||In the search bar type '''Pulley system'''.
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||01:58
||Right click on '''pulleysystem_en.htm ''' file.

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||02:04
||Select the option '''Open With Firefox web Browser'''.

'''Pulley System App''' opens in the browser.
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||02:13
||The '''App''' interface opens with two panels.

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||02:17
||A yellow panel with a pulley system and

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||02:20
||A green panel to change and display parameters.
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||02:25
||In the yellow panel, notice that a load is attached to the pulley with the help of a rope.
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||02:33
||We can either raise or lower the load using a '''Springscale. '''
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||02:38
||Click and drag the mouse to raise or lower the load.

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||02:43
||Observe that there is no change in the value on the right panel.

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||02:48
||This is because the necessary force required to drag the load remains the same.
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||02:55
||On the top of the green panel you can see a drop down list of pulleys.

List has 2, 4, and 6 pulley systems.
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||03:07
||The weight of the load is displayed in the white box.

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||03:12
||The default weight of the load is 14 '''Newton'''.

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||03:16
||We can change the value of the weight from 1 '''Newton''' to 40 '''Newton'''.
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||03:22
||We can change the '''Weight of the loose pulley '''in this box.
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|| 03:27
|| This is the total weight of the 4 pulleys.
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||03:31
||The '''Necessary force''' used to lift the load is calculated using the '''App'''.
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||03:36
||At the bottom of the green panel we have '''Springscale''' and '''Force vectors''' radio buttons.

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||03:43
||By default '''Springscale''' is selected.
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||03:47
||Let us demonstrate the working of the pulley.
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||03:51
||Observe that weight of 20 '''Newton''' is hanging from the 4 pulley sections of the rope.

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||03:58
||Each section of the rope has one fourth of the total weight.

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||04:03
||In the '''App''' force required to raise the weight in air is calculated.
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||04:10
||The '''Necessary force''' is calculated using formula.

'''F= (Wl+ Wp) upon 4'''

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||04:18
||'''Wl''' is '''weight of the load'''.

'''Wp '''is '''weight of the loose pulley'''.
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||04:26
||Now change the '''Weight of the loose pulley''' to 20 '''Newton'''.

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||04:31
||Observe that the '''Necessary force''' is changed to 10 '''Newton'''.
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||04:36
||Next change the weight of the load to 30 '''Newton'''.
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||04:40
||observe that the '''weight of the loose pulley''' has changed to 10 '''Newton'''.

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||04:46
||This is because the '''Springscale’s''' limit is 10 '''Newton'''.

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||04:51
||Values more than 10 '''Newton''' are automatically changed.

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||04:57
||As an assignment, Change the weight of the load to 25 Newton and weight of the loose pulley to 10 Newton.

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||05:06
||Calculate the necessary force and verify your answer from the App.

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||05:12
||Next we will move on to '''Lever Principle App'''.

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||05:16
||To open '''Lever Principle App''' right-click on '''lever_en.htm''' file and '''Open With Firefox Web Browser'''.
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||05:27
||This '''App''' shows a symmetrical lever with some mass pieces.

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||05:32
||Each mass piece weighs 1 '''Newton'''.
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||05:36
||At the bottom of the interface '''Lever Principle ''' is defined.

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||05:41
||A lever is in balance if the total left side torque is equal to the total right side torque.
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||05:48
||Observe that the lever arm is shown by green and orange rectangles.

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||05:54
||Length of each rectangle is 0.10 '''meter'''.
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||05:59
||At the bottom left of the screen torque is calculated.
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||06:05
||Torque is the twisting force that tends to cause a rotation.

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||06:10
||The point where the object rotates is the axis of rotation.
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||06:16
||In the '''App''' fulcrum is the axis of rotation.
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||06:21
||We can calculate the torque using the formula.

'''(tau)τ <nowiki>= F x r</nowiki>⟂'''(perpendicular).

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||06:29
||Green and orange rectangles indicate perpendicular distances.
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||06:35
||We can change the hanging weight by clicking and holding the mouse.
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||06:40
||Observe that, the lever is unbalanced.

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||06:44
||This is because torque on both the sides is not same.
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||06:49
||Notice that the value of left side torque is reduced to '''0.9 Nm'''

'''(Newton-meter)'''.
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||06:56
||What happens when hanging weights are removed from both the sides.
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||07:01
||Let us hang the weights at different distances to the left of the fulcrum.
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||07:07
||Click and hold the mouse to add one weight on the third rectangle.
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||07:13
||Add two weights on the fourth rectangle.

And one weight on the fifth rectangle.
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||07:21
||Observe that the lever is now unbalanced.
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||07:25
||Let us add weights to the right side of the fulcrum to balance the lever.
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||07:31
||Click and hold the mouse to add one weight to the first rectangle.
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||07:37
||Continue to add weights to third, fourth and fifth rectangles.
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||07:43
||Notice that the lever is now balanced.
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||07:48
||As an assignment solve this numerical.

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||07:53
||Let us summarize
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||07:55
||In this tutorial we have,

Simulated the working of a pulley system.

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||08:01
|| Calculated the necessary force to pull the load.

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||08:05
|| Achieved a balance condition for the lever.

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||08:09
|| Calculated the torque.

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||08:12
|| These Apps are created by Walter-fendt and his team.

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||08:17
||The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.
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||08:25
||Spoken Tutorial Project team, conducts workshops using spoken tutorials and gives certificates on passing online tests.

For more details, please write to us.

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||08:39
||Do you have questions in THIS Spoken Tutorial?

Please visit this site

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||08:45
||Choose the minute and second where you have the question. Explain your question briefly

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||08:51
||The Spoken Tutorial project will ensure an answer. You will have to ask questions.

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||08:59
||The Spoken Tutorial forum is for specific questions on this tutorial

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||09:04
||Please do not post unrelated and general questions on them

This will help reduce the clutter

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||09:12
||With less clutter, we can use these discussion as instructional material.

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||09:18
||Spoken Tutorial Project is funded by MHRD, Government of India.
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||09:24
||This is Himanshi Karwanje from IIT-Bombay.

Thank you for joining.
|-
|}

Apps-On-Physics/C2/Simple-Machines/English-timed - Revision history

PoojaMoolya: Created page with " {|border=1 || '''Time''' || '''Narration''' |- ||00:01 ||Welcome to this spoken tutorial on '''Simple Machines'''. |- ||00:05 ||In this tutorial we will learn to, |- ||00:0..."