Make a Pulley
Emergency! White water rafters have overturned their raft, and the speeding current is pulling them toward a waterfall. A helicopter zips in and lowers the rescue bucket. The distressed rafters climb in and are pulled to safety. What simple machine is at work in the helicopter bucket? Here's a hint: it involves a wheel, groove, and rope. If you said pulley, you're right! In this project, you'll use paperclips and string to make a pulley.
The helicopter bucket uses a pulley. Think of other examples of pulleys. Some that you might have seen are a construction crane, elevator, flag pole, old-fashioned water well, and exercise machines. Can you think of any others?
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