Difference between revisions of "Block pull"

From PhyLab
Jump to navigation Jump to search
 
(One intermediate revision by one other user not shown)
Line 4: Line 4:
  
 
==Description==
 
==Description==
Pull a wooden block using a string.
+
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==
 
*block and string
 
*block and string
 +
*spring scale
 +
*masses
 +
*optional: different surfaces taped to the table (paper, fabric, wood plank, etc.)
 +
*optional: protractor
  
 
==Instructions==
 
==Instructions==
Pull the block using the string. The block will slide across the table as long as the angle of the string is not too big (less than 90 degrees).
+
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==
block, string, pull
+
block, string, pull, friction
  
 
==Images & Movies==
 
==Images & Movies==
Line 19: Line 24:
 
File:1K20.30_1.JPG|Figure1
 
File:1K20.30_1.JPG|Figure1
 
</gallery>
 
</gallery>
 +
{{#widget:YouTube|width=600|height=337|id=htEkjbZuCRg}}

Latest revision as of 15:36, 17 August 2017

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