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Work, a force through a distance
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· As in the illustration, pushing in the same direction that the object moves
· Shown in Figures 6.1 and 6.2
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Use the parallel component if the force acts at an angle |
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For a infinitesimal movement, the work done is
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Under constant force:  |
Under multiple forces:  |
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Work-energy theorem (功能定理)—Figure 6.8 |
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Work-energy theorem:
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| The work done by the net force on a particle equals the change in the particle’s kinetic energy (动能).
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We can compare the kinetic energy of different bodies |
Changes in the energy of a moving body under the influence of an applied force change differently depending on the direction of application.
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Work and energy with varying forces—Figure 6.16 |
Work is the area under a force versus position graph. |
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