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After viewing the video and participating in the follow-up activities, students will be able to:
Recognize when work is done.
Identify various forms of energy including gravita- tional potential, kinetic, etc.
Calculate the efficiency of an energy conversion.
Identify factors which affect the efficiency of a conver- sion.
Use the equation Q = mct to find any one of the variables given data for the other three.
This video is one of a series. Before students view this pro- gram and complete the follow-up activities, they should be able to:
1. Define “work.” Work is a transfer of energy from one object or system to another.
2. Cite evidence that cellular respiration does not convert all the energy in glucose to adenosine triphosphate (ATP).
Some of the energy released during cellular respiration main- tains body temperature – it becomes thermal energy.
3. Identify the energy conversions that occur when a per- son dives into a swimming pool from a 3.0 m tower.
The person, when on the diving board, has gravitational poten- tial energy, which is converted to kinetic energy during the dive, and finally to thermal energy of the water as the diver comes to a stop.
4. State the second law of thermodynamics. Heat always flows from a hotter object to a cooler object.
If students have difficulty with any of the items, you should review the concepts in reference materials before viewing the video.