Atwood Machine

Item # 91-6116

Regular price $36.00
Regular price Sale price On Sale $36.00
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Buy 6 and pay $33.00 each!

The Atwood machine is a simple and robust device for exploring linear acceleration concepts. It consists of two 50 mm ball bearing pulleys connected by an aluminum rod.

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Additional Details

Simple and effective, the Atwood machine cuts down on prep time and lets students dig into their experiments right away. Use this device with basic knowledge of classical physics to:

  • derive a constant acceleration equation
  • determine acceleration due to gravity
  • verify laws of motion with constant acceleration
  • investigate methods of determining tension in a string

This Atwood machine uses robust materials and two 50 mm low-friction ball bearing pulleys. The pulleys are joined with an aluminum rod, making the device easy to mount to any ring stand. Students can easily measure the time of the drop with manual stopwatches or set up photogates to more accurately determine time over a known distance.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to

Products being sold are not toys. They are for Educational / Laboratory use only. They are not for use by children 12 and under.

Features & Specs

  • Pulleys: 50 mm diameter with ball bearings
  • Aluminum rod: 70 mm long, 13 mm diameter
  • Length overall: 210 mm


Order Qty Price Qty for Discount Discount Price Total Savings
No-Stretch Pulley String, 25 meters No-Stretch Pulley String, 25 meters Item # P1-6110
$4.75 50 $4.40
Meter Stick 6/pk Meter Stick 6/pk Item # P1-7072
$24.95 10 $22.50
Hooked Mass Set of 9 Hooked Mass Set of 9 Item # 91-1000
$49.95 12 $45.00
Digital Stopwatch Timer Digital Stopwatch Timer Item # 52-3200
$8.75 10 $8.10
Timer and Photogates Timer and Photogates Item # P4-1450
$320.00 6 $288.00
Ring Stand, 6 Ring Stand, 6" x 9" Base, 24" Rod Item # 66-4230
$19.50 6 $17.50
Clamp Holder Clamp Holder Item # 66-8290
$4.95 10 $4.70