This powerful strip-mining shovel is able to remove tons of earth in a single load of its bucket.
Problem Identification, Formulation, and Solution
How can you improve the efficiency of a machine?
Look for some examples of simple machines in your school or at home. Form a small group and discuss with your classmates how these machines make it easier to do work. Discuss possible ways to increase the efficiency of one of these machines. Work with your group to produce a short video about your ideas. In the video, offer suggestions on how to maximize the work that can be done by the machine.
How do science concepts apply to your world? Here are some questions you'll be able to answer after you read this chapter.
Why can a snow blower remove snow faster than a person using a shovel? (Section 14.1)
How can you lift a car using your hands? (Section 14.2)
How does a nutcracker make it easier to crack a nut? (Section 14.3)
Why are the trails up mountains constructed to be long and winding? (Section 14.4)
Why do bicycles have gears? (page 436)