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PICKING UP HEAVY METAL 2

Pick up heavy weights easily with a double pulley system

Suitable For

Grades 7

Difficulty

3

Time Required

 <12 Hours

Supervision

Advised

What’s it about?

A ‘pulley’ is a simple ‘machine’ that is used to change the amount or direction of a pulling force to make work easier. A simple ‘pulley’ consists of only a rope that is looped around a support (usually a wheel). More complex pulley systems like a ‘two-pulley’ or ‘double pulley’ system can make your work even easier, but it comes at a cost…more rope! Let’s explore how a double pulley system works with this science experiment:

Topics covered

Pulley system, Gravity, Block and tackle

What will I need?

  • 2x CHAIRS
  • BROOM STICK
  • SPOOL
  • SMALL BUCKET
  • ROPE (THIN & STRONG)
  • WIRE COAT HANGER

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

This science experiment works because the broomstick, rope and spools has been put together to form of a common device called a pulley system, a simple device that magnifies perceived effort or pull forces. Pulleys make it easier to lift heavy loads by changing the direction and / or amount of a pulling force. In this experiment, the double pulley system magnifies your force, but at a cost of using more rope to achieve this. In other words, to pull with less force, you must pull farther and therefore use more rope. You will pull with less force, but over a greater distance. You do the same amount of work, but it just feels easier!

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