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2012-11-27T14:21:51Z

Created page with '[http://spoken-tutorial.org/wiki/images/4/44/Resources-Introduction_to_STEP.zip Resources for "Introduction to STEP"] <center>'''Introduction to STEP '''</center> {| style="b…'

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[http://spoken-tutorial.org/wiki/images/4/44/Resources-Introduction_to_STEP.zip Resources for "Introduction to STEP"]

<center>'''Introduction to STEP '''</center>

{| style="border-spacing:0;"
| style="border-top:0.002cm solid #000000;border-bottom:0.002cm solid #000000;border-left:0.002cm solid #000000;border-right:none;padding:0.097cm;"| <center>'''Visual Cue'''</center>
| style="border:0.002cm solid #000000;padding:0.097cm;"| <center>'''Narration'''</center>

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 1
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Hello.

Welcome to this tutorial on how to use STEP

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 2

Slide 3

Slide 4

Slide 5
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| STEP is an interactive tool for Physics.

Using this tool we can model the physical world by selecting objects and

changing the parameters by which they interact.

STEP is part of the KDE project and can be downloaded using the Synaptic Package Manager.

In this tutorial on STEP, I have worked on Ubuntu version 10.04 LTS and STEP version 0.1.0 KDE 4.4.5

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 5. Open STEP
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Now we will look at how to open STEP.

Click on Applications, go down to Education

scroll down to STEP.

Click on it. This will open the STEP window.

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| STEP window

Mouse over the palette, world scene and each of the panels

Settings Tab and Adding Panels

Tab to the World Panel

Context information panel

Properties Panel
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| The STEP window has three main components.

On the left hand side, you will have the palette from which different objects can

be added for the simulation, different interactions that can be added to the

objects and various components through which the interactions can be added

to the objects.

In the middle, you have the world scene where the simulation can be built .

On the right hand side, you have an area where different panels can be

displayed.

What you see displayed now are the properties panel and the world panel.

You can add more panels for display here from the settings tab and by clicking

on panels. If I add the Context Information, the context information panel

will be added to this window.

The world panel here gives information about all the objects and

interactions in the simulation. It will also give us information about the various algorithms that are used to run the simulation. In this tutorial we

will not be looking at the details of these algorithms. These may have to be

learned using separate tutorials.

The context information gives you specific information about each of the

objects that are part of the simulation.

The properties panel is where you can define the parameters of the objects

that are part of the simulation and they will be displayed here when the

simulation is being run.

One more panel which can be added is that of the history panel which will give

us information about how the simulation was built. In this simulation we will

not add the history panel.

We will look at how to build a simulation using STEP. Before that we will

briefly summarize what we have looked at so far.

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 6 - 8
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| There are three main components - the palette, the world scene and the panels

on the right, which are the world, the properties panel, the context information

and the simulation history.

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 9

Slide 10

Slide 11

Slide 12
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Now we will introduce a particle on the world scene and define the parameters

of the particle in the properties panel.

We will add forces which will add the conditions we want to simulate.

And we will run the simulation.

We will see how STEP works by the simulation of free fall of two objects.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| STEP window
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| We will simulate the free fall of two disks. We click on Disk and click on the

World Scene. I click on disk again and I click on the world scene.

Disk 1 is at position (-1.21,1,36). Disk 2 is at (0.78, 1.53). These positions

refer to the position of centre of mass of these disks.

Now for this simulation, I want both these disks to be at the same vertical

position above the x-axis. So I will change the y-co-ordinate of Disk 1 also to 1.53. Notice that the disk has moved up.

Now I want to redefine the size of the second disk.

I click on the box here and move it and the disk becomes smaller. The size can

also be changed by clicking on the properties panel and changing the value of

the radius here.

I also want to redefine the mass of the second disk to be 1000 kg.

Now we will add two weight forces, which are interactions, to these disks.

Weight force is the acceleration due to gravity that will be experienced by a

mass and has a value of 9.8 m/s<sup>2 </sup>and is a constant.

I click on weight force. I click on weight force again. Weight force has been

added on each of the disks.

Now we are ready to run the simulation.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Simulation starts

Properties panel
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| If you look at the world panel here, you will see that the disk 1, disk 2, weight

force 1 and weight force 2 are all displayed here.

Now we are ready to run the simulation. We stop the simulation. Now we will

look at the properties of the disks.

Disk 1 is at (-1.21, -4.134). Disk 2 is at (0.78,-4.134). They are both at the

same y-co-ordinate position in the negative y-axis. The velocity of Disk 2 is

-14.91 m/s and the velocity of disk 1 is also -14.91 m/s.

This is an important result in the understanding in the study of gravitation.

We know that these disks were of two different masses and sizes. Yet when

they were subjected to free fall for the same amount of time, they

traveled the same distance and reached the same final velocity.

The final velocity of an object undergoing freefall is independent of the mass of

the object.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| File – Save-As dialog box
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Now we will look at how to save the simulation. Click on File – Save As. We

will call this as examplefreefall.step. All simulations under this application will

be saved with the extension “.step”. Next time we want to demonstrate the

simulation, we can simply open examplefreefall.step and simulate.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"|
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Now we will look at an assignment to reinforce our understanding of STEP.

Before we look at an assignment, we will see how and where to use STEP

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 13

Slide 14

Slide 15

| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| STEP can be used to illustrate complex interactions in mechanics.

After the theory has been introduced, the models can be built and simulated to reinforce

understanding.

This can be used as a supplement for syllabus at the college

level.

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| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 16

Slide 17

Assignment simulation built
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Now we will simulate a scenario when a ball is thrown upwards at a given

angle to the horizontal.

What is the path it takes and why would it follow such a path?

The simulation when built will look like this.

The blue arrow indicates the velocity of the object and the red arrow indicates

the weight force.

When you click on simulate, you will see that it quickly follows a parabolic

path. Explain why it would take such a path.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 18

Slide 19

Slide 20
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| I would like to acknowledge the Spoken Tutorial Project which is a part of a

Talk to a Teacher Project.

Supported by the National Mission on Education through ICT, MHRD,

Government of India

More information can be found here.

|-
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:none;padding:0.0382in;"| Slide 21
| style="border-top:none;border-bottom:0.0007in solid #000000;border-left:0.0007in solid #000000;border-right:0.0007in solid #000000;padding:0.0382in;"| Thank you for joining me on this exploration of STEP. Hope you have fun exploring Physics using this tool. Thank you.

|}

Step/C2/Introduction-to-STEP/English - Revision history

Chandrika: Created page with '[http://spoken-tutorial.org/wiki/images/4/44/Resources-Introduction_to_STEP.zip Resources for "Introduction to STEP"] '''Introduction to STEP ''' {| style="b…'