Hello class,
We'll be doing a science project today. We'll be making a simple machine called a
pulley. We'll use objects you probably have around the house. I recommend you work on it today but if you don't have the right objects, then try to finish it over the weekend.
Here's what you'll need:
* Scissors
* Tape
* The carton in the middle of toilet paper or paper towels.
* A large book or small box.
* A pen/pencil.
Here are all my supplies.
First you take your toilet paper cartons. On the edge cut a small square big enough for your pencil to go in.

Then hold it next to the other carton. Use your pen to mark how far down the cut you made is. Then cut another small square into the other carton. This way both of your cuts are the same size.
Then put one carton to the back of the other and make another small mark so you know how far to cut and then cut another small square.
Do the same to the other carton. Now you should be able to set your pencil in the cartons. Place a roll of tape (or some other circular object around the pen/pencil and then place it in the middle of the the two cartons, like this.
Now we need to secure the bottom. Take pieces of tape and tape the bottom of the two cartons to something strong, like a heavy book or a box. I used a puzzle box.
Now take your string and wrap it around some small object to lift up. I chose a candle.
Place the object on the ground and the string around the circular object between the two cartons.
Now all you have to do is pull the string down on one side, and watch the object rise on the other!
Try it yourself and take some pictures or short videos. What is the heaviest object you can lift with your
pulley? Send them to me and I'll put them on this blog!
-mr. J