Use the wire cutter to cut through the bottom of the hanger.
Many simple machines use a pulley in order to change the direction of a force. Pulleys also allow you to use the force of gravity so that less initial force is required. You can design your own model of a pulley for science class, or even to be included in a science fair. All you'll need is a few simple materials you can find around the house, as well as a place to hang your model.
Things You'll Need
- Wire cutter
- Wire coat hanger
- Wooden spool
- Weight (e.g., book)
Slide the spool onto one of the cut ends of the hanger and poke the other end through so that a wire end protrudes from each end of the spool.
Bend down both wire ends to keep the spool in place.
Hang the hanger from a sturdy place, such as a hook or a closet pole.
Slide a string over the top of the spool, and tie the weight to one end of the string.
Pull the other end of the string to demonstrate how a pulley works.
Tips & Warnings
- Use a spring scale to demonstrate how the pulley reduces the force needed to lift an object.
- Be careful when handling the sharp edges of the cut wire.
- Photo Credit pulley of a boat image by timur1970 from Fotolia.com
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