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Unit 4: Energy (Part 1) Page 19
Activities, Experiments, Projects
Lesson 2: Pulleys
Note: This section is an abbreviated overview of the experiments online.
the cup…not your finger! Thread
Experiment: Simple Pulleys about 4 inches of string or a pipe
cleaner through both holes. Make
Are you curious about pulleys? This sure the string is a little loose.
set of experiments will give you a Make two of these mass carriers.
good taste of what pulleys are, One is going to be your load (what
how to thread them up, and how you lift) and the other is going to
you can use them to lift heavy be your effort (the force that does
things. Are you ready? the lifting).
For this experiment, you will need: 2. Dangle the pulley from the table
(check out the picture).
· One pulley (from the
hardware store… get small 3. Bend your two paper clips into
ones that spin as freely as hooks.
possible. You’ll need three
single pulleys or if you can 4. Take about three feet of string
find one get a double pulley and tie your paper clip hooks to
to make our later experiment both ends.
easier.)
· About four feet of string 5. Thread your string through the
· 2 paper cups pulley and let the ends dangle.
· many little masses (about 50
marbles, pennies, washers 6. Put 40 masses (coins or
etc.) whatever you’re using) into one of
· Yardstick or measuring tape the mass carriers. Attach it to one
· A scale (optional) of the strings and put it on the
· 2 paper clips floor. This is your load.
· Nail or some sort of sharp
pokey thing 7. Attach the other mass carrier to
· Table the other end of the string (which
should be dangling a foot or less
1. Take a look at the video to see from the pulley). This is your
how to make your “mass carriers”. effort.
Use the nail to poke a hole in both
sides of the cup. Be careful to poke
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