Pulley Demonstration System

Product Code: SE-8685


The Pulley Demonstration System is designed to complement demonstrations of simple machines. From the wheels on a bicycle to the gears in a car, the Pulley Demonstration System helps explain how things work. Students quickly learn that using more pulleys reduces the force required to lift an object, but increases the amount of string that must be pulled. These exercises demonstrate that the amount of work done is independent of the number of pulleys used.

Application 1: Set up a double pulley and single pulley, placing a 200 g mass on each one. Simultaneously pull each pulley’s string from the same vertical height down to the base. Notice that the single pulley’s mass moves twice as high as the double pulley’s with twice the force.

Application 2: Attach Newton Spring Scales to quantitatively demonstrate that the double pulley’s exerted force decreases by a factor of 2, while the amount of pulled string increases by the same factor. From here, students can easily prove that the number of pulleys is equivalent to this factor. Students will learn that the number of pulleys is equal to the mechanical advantage, and that the amount of work done is the same for both pulleys.


  • Stable Base: Easily attach two threaded 81 cm rods to the sturdy base. An eye-hook and capstan are included to demonstrate an entire pulley system.
  • Comprehensive: Contains everything needed to effectively display the usefulness of pulleys, including slotted masses and mass hangers.
  • Several Pulley Types: Reveal the benefits of single pulleys, tandem pulleys, quadruple pulleys and even the 4-step pulley. Combine several of them for an efficient pulley system.


  • Demonstrate the mechanical advantage of using a pulley or pulley system
  • Measure mechanical and force differences between single and double pulleys
  • Determine the Work/Energy of a Pulley System using a Rotary Motion Sensor and Force Sensor
  • Discover the Mechanics of a Wheel and Axle using a 4-Step Pulley

What’s Included

  • 1x 20 cm x 81 cm base with eye-hook and capstan
  • 2x Threaded 81 cm rods
  • 2x Clamps
  • 1x Horizontal rod
  • 8x Hook collars
  • 1x 90° clamp
  • 2x Single pulleys
  • 2x Triple-tandem pulleys
  • 2x Quadruple pulleys
  • 1x Four-step pulley
  • 13x Slotted masses
  • 6x Mass hangers

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