Science Project:

# Make a Pulley

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### Problem:

To simulate a helicopter rescue by making a simple pulley from household items.

### Materials:

• 2 paperclips
• 36 inches of string
• Small figurine
• Notebook and pencil

### Procedure:

1. Unbend the center of a Paperclip 1 so that it makes a hook.
2. Tie Paperclip 1 to the end of a piece of string.
3. Thread the loose end of the string through Paperclip 2. You just made a pulley!
4. Put the figurine in your berry basket, and place both on the ground.
5. Now, lower Paperclip 1 to hook the basket.
6. Pull the loose end of the string through Paperclip 2, raising the basket.

### Results:

Your helicopter rescue was a success! You created a pulley using paperclips and string, and you used your pulley to lift a basket.

### Why?

Pulleys are all around us. Look at your window blinds. Notice that when you pull the string down, the blinds go up. This is a pulley at work. A pulley is a simple machine used to make lifting easier. If you drop your book on the floor, you can bend down and pick it up, no problem. When it comes to putting a roof on a house, though, construction workers can't just bend down and pick it up since it is so big. A pulley allows the work to be done from a crane; the machine construction workers use to lift heavy materials. The force in the crane pulls down, and the roof goes up. Pulleys are useful tools that can even be life-savers. Just ask the white water rafters!

Now that you're a pulley expert, it's time for more guessing and testing. Think about the strength of the different parts of the pulley: What other items do you think you can lift? How many can you pick up? Which would be easier to lift with your pulley: a book or a doll? Can your pulley be used to move things from side-to-side, or just straight up and down? Write down any guesses that you have, called hypotheses, in your notebook before testing your new problems.

Keep thinking like a scientist, and you can conduct endless investigations with your paperclip pulley.

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