Difference between revisions of "Linear Momentum Conservation"

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=Description of the Experiment=
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=Decription of the Experiment=
The purpose of this experiment is to study the concepts of '''reference frame''' and '''center of mass'''.
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The pedagogic purpose of this experiment is to teach users about concepts like '''reference frame''', '''center of mass''' and '''conservation of linear momentum'''.
 +
 
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This experiment encompasses not only conservation of momentum, it also shows the collision in four different reference frames: the center of mass's, each vehicle's and Earth's.
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To achieve this, two cars are launched and will collide with eachother and, while that happens, the control sistem calculates the speed at which the camera should move to film the reference frame chosen by the user.
 +
 
 +
By recording and reviewing the video, the user can see all the physical phenomena. The control room gives the cars' inicial and final speeds.
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 +
 
 +
=Who likes this idea=
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[[File:CienciaViva.gif|link=http://www.cienciaviva.pt/escolherciencia/|border|204px|border|204px]]
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[[File:ECB Logo.png|link=http://www.externatobenedita.net/|border|150px|border|150px]]
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[[File:Logo_alberto_cores.jpg|link=http://www.es-al-berto.com/|border|120px|border|120px]]
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[[File:LogoAEA_800x132.jpg|link=http://aealvalade.edu.pt/|border|280px|border|280px]]
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This idea is the result of the PEC26 contract with Ciência Viva - The portuguese Agency for Cientific and technological Culture and its objectives are (i) sharing (through the internet) existing experimental setups that some high-schools have but are not in use and (ii) promote teaching cience through the use of experimental activities. The automation of the experiment was made by IST students as part of the e-lab project.
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The first school involved in this experiment were Escola Secundária Padre António Vieira, Alvalade/Lisboa and Externato Cooperativo da Benedita, Leiria. Escola Secundária Poeta Al Berto in Sines also colaborated.
  
  
 
=Experimental Apparatus=
 
=Experimental Apparatus=
[[File:Colisao-fig1.png|thumb|Experimental setup]]
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[[File:Colisao-fig1.png|thumb|Setup]]
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UNDER CONSTRUCTION
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{| border="1"
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! scope="col" | Quantity
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! scope="col" | Value
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|-
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|Car A's mass
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| 215.4±1 gr.
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|-
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|Car B's mass
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| 237.1±1 gr.
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|}
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==The Cars==
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UNDER CONSTRUCTION
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<div class="toccolours mw-collapsible mw-collapsed" style="width:420px">
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'''What's a photocell?'''
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<div class="mw-collapsible-content">
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UNDER CONSTRUCTION
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</div>
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</div>
  
This experiment is composed of:
 
* 1 track
 
* 2 cars
 
* 1 step motor
 
* 2 electric motors
 
* 2 parking sensors
 
* 1 electronic circuit with:
 
** 1 circuit to turn the stamp on
 
** 2 motion detectors
 
  
  
 
=Protocol=
 
=Protocol=
The user can choose the following parameters:
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UNDER CONSTRUCTION
* Car A's energy
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* Car B's energy
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* Reference frame where the collision will be observed:
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=Advanced Protocol=
** car A
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UNDER CONSTRUCTION
** car B
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** center of mass
 
** laboratory
 
  
# Choose each car's initial speed;
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=Links=
# After several runs, with the information of initial and final speed, verify the conservation of momentum and energy;
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*[[Conservação do Momento Linear | Portuguese Version (Versão em Português)]]
# Do a few runs with the camera fixed on one of the cars and on the center of mass and make some remarks;
 
# Repeat for several combinations of initial speeds.
 

Revision as of 11:25, 20 October 2013

Decription of the Experiment

The pedagogic purpose of this experiment is to teach users about concepts like reference frame, center of mass and conservation of linear momentum.

This experiment encompasses not only conservation of momentum, it also shows the collision in four different reference frames: the center of mass's, each vehicle's and Earth's.

To achieve this, two cars are launched and will collide with eachother and, while that happens, the control sistem calculates the speed at which the camera should move to film the reference frame chosen by the user.

By recording and reviewing the video, the user can see all the physical phenomena. The control room gives the cars' inicial and final speeds.


Who likes this idea

CienciaViva.gif ECB Logo.png Logo alberto cores.jpg LogoAEA 800x132.jpg


This idea is the result of the PEC26 contract with Ciência Viva - The portuguese Agency for Cientific and technological Culture and its objectives are (i) sharing (through the internet) existing experimental setups that some high-schools have but are not in use and (ii) promote teaching cience through the use of experimental activities. The automation of the experiment was made by IST students as part of the e-lab project.

The first school involved in this experiment were Escola Secundária Padre António Vieira, Alvalade/Lisboa and Externato Cooperativo da Benedita, Leiria. Escola Secundária Poeta Al Berto in Sines also colaborated.


Experimental Apparatus

Setup

UNDER CONSTRUCTION

Quantity Value
Car A's mass 215.4±1 gr.
Car B's mass 237.1±1 gr.

The Cars

UNDER CONSTRUCTION

What's a photocell?

UNDER CONSTRUCTION


Protocol

UNDER CONSTRUCTION


Advanced Protocol

UNDER CONSTRUCTION


Links