![]() ![]() In contrast, work done on the briefcase by the person carrying it up stairs in Figure 1d is stored in the briefcase-Earth system and can be recovered at any time, as shown in Figure 1e. For example, if the lawn mower in Figure 1a is pushed just hard enough to keep it going at a constant speed, then energy put into the mower by the person is removed continuously by friction, and eventually leaves the system in the form of heat transfer. What happens to the work done on a system? Energy is transferred into the system, but in what form? Does it remain in the system or move on? The answers depend on the situation. Explain and apply the work-energy theorem.Explain work as a transfer of energy and net work as the work done by the net force. ![]() By the end of this section, you will be able to: ![]()
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