This demonstration shows how a screw is actually an inclined plane wrapped around a center post.

Materials:
Pencil
Paper
Colored felt tip marker
Scissors

Procedure:

1. Cut a right triangle from the paper. The dimensions should be about 5 inches, by 9 inches, by 10.3 inches.

2. Use the felt tip marker to color the longest edge (10.3 inches) of the triangle.

3. Position the shortest side (5 inches) of the triangle along the side of the pencil and then evenly wrap the paper around the pencil by rolling the pencil.

4.  You have just taken an inclined plane and made a screw.         

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