Screw: A screw is a simple machine
that is made from another simple machine. It is actually an
inclined plane that winds around itself. A screw has ridges and
is not smooth like a nail. Some screws are used to lower and
raise things. They are also used to hold objects
The girl in this picture is taking a lid off of a
jar. Jars use simple machines to hold the lids on the
top. When you turn the lid, it raises or
Where would I find an example of a
- Jar Lids
- Light Bulbs
- Key Rings
- Spiral Staircase
Try this experiment!
Nine inch paper square,
pencil, tape, marker, tabletop
Cut the square in half
to make a right triangle. Use the marker to outline the
diagonal side of the triangle. Now place the paper face down on
the table. Place the pencil on one of the short sides of the
triangle. Wrap the pencil around the triangle. Use the
tape to keep it in place.
Things to think about during the
-What simple machine is the right
-What simple machine was created when you wrapped
the pencil around the triangle?
-Name some examples of this
You made a screw out of
an inclined plane when you wrapped the triangle around the
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