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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?
Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state's handbook of Science Safety.