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 attachment:BlockonStringMain-400.jpg  attachment:PulledWoodBlock02-400.jpg
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A glider on a level air track is pushed giving it a velocity which remains roughly constant on the low-friction surface. A timer together with a known displacement can be used to measure the velocity. A wood block with attached string is pulled horizontally across a table at constant velocity in front of a meter stick. The time interval of the displacement can be measured using a stopwatch so that the velocity can be calculated.
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 1. Place the edge of front of the block at the beginning of the meter stick.
 1. Hook up the DMM or multipurpose meter in stopwatch mode. Click the respective link for setup/operation information.
 1. Begin to pull the block with constant force and maintain that force until the leading edge of the block makes it to the end of the meter stick.		  1. Position the block such that the front face of the block is in line with the edge of meter stick.
 1. Hook up the [:Table DMM-Timer:DMM] or [:MultiPurposeCounter:multipurpose meter] in stopwatch mode. Click the respective link for setup/operation information.
 1. Begin to pull the block with constant force parallel to the meter stick. Maintain that force until the front face of the block makes it to the end of the meter stick.
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 1. The velocity can be calculated using the equation for velocity: v = (x,,f,,-x,,i,,)/(t,,f,,-t,,i,,).  1. The velocity can be calculated using the proper equation: v = (x,,f,,-x,,i,,)/(t,,f,,-t,,i,,).
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 * List any references  * N/A

[:PiraScheme#Mechanics: Table of Mechanics Demonstration]

[:MEEquipmentList: List of Mechanics Equipment & Supplies]

[:Demonstrations:Lecture Demonstrations]

Block of Wood on a String, 1C10.21

Topic and Concept:

  • Motion in One Dimension, [:MotionIn1D#Velocity: 1C10. Velocity]

Location:

Abstract:

A wood block with attached string is pulled horizontally across a table at constant velocity in front of a meter stick. The time interval of the displacement can be measured using a stopwatch so that the velocity can be calculated.

Equipment

Location

ID Number

Blocks of Wood on a String

ME, Bay B5, Shelf #2

DMM or Multipurpose Timer

WS, Bay B1, Shelf #2

Meter Stick

ME, Bay B1, Shelf #2

Important Setup Notes:

  • N/A

Setup and Procedure:

  1. Place a meter stick on the lecture bench.
  2. Position the block such that the front face of the block is in line with the edge of meter stick.

  3. Hook up the [:Table DMM-Timer:DMM] or [:MultiPurposeCounter:multipurpose meter] in stopwatch mode. Click the respective link for setup/operation information.

  4. Begin to pull the block with constant force parallel to the meter stick. Maintain that force until the front face of the block makes it to the end of the meter stick.
  5. Have someone run the stopwatch beginning timing at the start of motion and ending when the block travels 1 m.

  6. The velocity can be calculated using the proper equation: v = (xf-xi)/(tf-ti).

Cautions, Warnings, or Safety Concerns:

  • N/A

Discussion:

Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate.

attachment:BlockonString02-250.jpg

attachment:BlockonString04-250.jpg

attachment:BlockonString05-250.jpg

attachment:BenchMeter04-250.jpg

Videos:

References:

  • N/A

[:Instructional:Home]

fw: Block_of_Wood_on_a_String (last edited 2013-07-12 18:18:01 by localhost)