Chapter 6. The work-energy theorem (6-9)

Question

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{"title":"Work done on an object by the net force on that object","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"7,1,52,52\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"152,2,191,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"251,3,293,52\"}]"}

Question

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{"title":"Work done on an object by the net force on that object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"7,1,52,52\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"152,2,191,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"251,3,293,52\"}]"}

Question

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{"title":"Work done on an object by the net force on that object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"7,1,52,52\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"152,2,191,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"251,3,293,52\"}]"}

Review

The units of kinetic energy are kg \(\cdot\) \(\mathrm{m}^2/\mathrm{s}^2\). Since 1J = 1N \(\cdot\) m and 1N = 1kg \(\cdot\) \(\mathrm{m}/\mathrm{s}^2\), you can see that kinetic energy is measured in joules, the same as work. Using the definition of kinetic energy given in Equation 6-8, we can rewrite Equation 6-7 as: