Block pull : Différence entre versions

De PhyLab
Sauter à la navigation Sauter à la recherche
(Created page with "__NOTOC__ Back to 1K - Applications of Newton's Law<br> PIRA index: 1H11.30 ==Description== An angled aluminum cylinder, mounted on a ...")
 
 
(2 révisions intermédiaires par un autre utilisateur non affichées)
Ligne 1 : Ligne 1 :
 
__NOTOC__
 
__NOTOC__
 
Back to [[1K_-_Applications_of_Newton%27s_Law|1K - Applications of Newton's Law]]<br>
 
Back to [[1K_-_Applications_of_Newton%27s_Law|1K - Applications of Newton's Law]]<br>
PIRA index: 1H11.30
+
PIRA index: 1K20.30
  
 
==Description==
 
==Description==
An angled aluminum cylinder, mounted on a friction-less surface, is filled with liquid CO2 from an spray duster can then sealed with a small aperture. The cylinder is heated and as the CO2 evaporates within the cylinder, gas is expelled through the aperture thus propelling the cylinder forward.
+
Pull a wooden block using a string. A minimal force proportional to the static friction coefficient is required to make the block move. This coefficient only depends on the surfaces, not the area of contact or the normal force.
  
 
==Equipment==
 
==Equipment==
*air track with pump and tubing, power cable
+
*block and string
*rocket cylinder with aperture and seal
+
*spring scale
*spray duster canister
+
*masses
*torch
+
*optional: different surfaces taped to the table (paper, fabric, wood plank, etc.)
 +
*optional: protractor
  
 
==Instructions==
 
==Instructions==
Connect the air track to the pump and turn it on. Invert the spray duster canister and shoot the liquid CO2 it into the rocket cylinder for about 3-4 seconds. Seal the rocket with the aperture and ball stopper and place it on the air track. Heat the lower end of the cylinder with the torch until the rocket starts to move along the track.
+
Pull the block using the string attached the the spring scale. Note the tension at which motion starts and then tension required to maintain motion. Change the orientation of the block, changing the surface area, and repeat. Add masses and repeat; the tension readings should proportional to the masses. Different surfaces can produce different result. Different angle between the surface and the string will produce different result.
 +
 
  
 
==Keywords==
 
==Keywords==
rocket, air track, CO2, carbon dioxide, friction-less, torch, evaporation, aperture
+
block, string, pull, friction
  
 
==Images & Movies==
 
==Images & Movies==
 
<gallery>
 
<gallery>
File:1H11.30_1.JPG|Figure1
+
File:1K20.30_1.JPG|Figure1
File:1H11.30_2.JPG|Figure2
 
 
</gallery>
 
</gallery>
 +
{{#widget:YouTube|width=600|height=337|id=htEkjbZuCRg}}

Version actuelle datée du 17 août 2017 à 15:36

Back to 1K - Applications of Newton's Law
PIRA index: 1K20.30

Description

Pull a wooden block using a string. A minimal force proportional to the static friction coefficient is required to make the block move. This coefficient only depends on the surfaces, not the area of contact or the normal force.

Equipment

  • block and string
  • spring scale
  • masses
  • optional: different surfaces taped to the table (paper, fabric, wood plank, etc.)
  • optional: protractor

Instructions

Pull the block using the string attached the the spring scale. Note the tension at which motion starts and then tension required to maintain motion. Change the orientation of the block, changing the surface area, and repeat. Add masses and repeat; the tension readings should proportional to the masses. Different surfaces can produce different result. Different angle between the surface and the string will produce different result.


Keywords

block, string, pull, friction

Images & Movies