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What Is a Pulley?

Resource for Grades Pre-K-1

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Media Type:
Video

Running Time: 1m 23s
Size: 5.6 MB

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KET's Everyday Science is funded in part by Kentucky Power and the American Electric Power Foundation and PNC Bank.

Related Resources:

Building Simple Machines: Plant Quencher
(Video)

Supplemental Media Available:

Everyday Science: Simple Machines (Interactive)

Background Essay

Machines make life easier—and sometimes more fun. Children can be encouraged to explore how wheels help cars, grocery carts, and doll buggies move. Springs, such as those found in clothes pins, can hang clothes on a clothesline, make sitting on the couch more comfortable, and add some fun to a pogo stick.

Pulleys are simple machines with few moving parts. This makes them a good tool for introducing more complicated concepts like design and function to very young children. This simple machine is made of a wheel with a rope that fits on the groove of the wheel. One end of the rope is attached to the load—the other end of the rope allows you to move the load up. Samples of pulleys include cranes (with a wrecking ball or one that lifts construction materials), clotheslines, and flag poles

As with all science activities, close supervision is required as children explore how machines work but everyday life offers many opportunities for children to observe simple machines and learn how they help people perform tasks and have fun.

The Teaching Tips will give you some ideas how to continue the conversation and expand on the content in the video.

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Teaching Tips

Activity: Wheels

Vocabulary

wheel, motion, axle, force

For this activity, you will need:

objects with wheels, e.g., bikes, tricycles, wagons, wheel barrows, doll carriages, shopping carts, etc.

spare wheels in various sizes that can be placed in learning center so that children can freely examine them.

journals for the children to document their experiences. You can make inexpensive journals by folding 3-4 sheets of paper in half and stapling on the fold line. Add a colored sheet for a cover if you like.

Directions
1. Sing “The Wheels on the Bus” with the children, encouraging them to make arm motions for “round and round.”
2. Ask the children, “Would wheels work if they were square instead of round?” and/or “What if a wheel comes off?” Encourage discussion.
3. Introduce the wheeled objects brought to the classroom. Encourage children to examine the wheels, compare the sizes and placement and how the wheels are attached to the frame.
4. Encourage the children to document what they have learned about the value and use of wheels in their journals.