Show that a screw is an inclined plane.
One class time
How do you make a screw?
Give each group of students the materials.
Give each student a paper right-triangle and have the longest side colored. Tape one of the uncolored sides of the triangle to the pencil. Wrap the triangle around the pencil and tape down.
The triangle wraps in a spiral.
Share their results.
The right triangle is an inclined plane.
A screw is an inclined plane that is wrapped around a center pole.
Look at roads that zig-zag down mts. or spiral around them.
Which path is greater? The distance up the pencil or the length of the edge of the triangle.
Take different types of screws and see how many turns it takes to get the screw in a block of wood.
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