Chapter 25. 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\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"3,5,56,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Incorrect","type":"incorrect","color":"#ffff00","code":"[{\"shape\":\"rect\",\"coords\":\"254,7,293,48\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"150,5,187,48\"}]"}

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\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"3,5,56,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Correct!","type":"correct","color":"#ffff00","code":"[{\"shape\":\"rect\",\"coords\":\"254,7,293,48\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"150,5,187,48\"}]"}

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\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"3,5,56,49\"}]"} {"title":"Kinetic energy of the object before the work is done on it","description":"Incorrect","type":"incorrect","color":"#ffff00","code":"[{\"shape\":\"rect\",\"coords\":\"254,7,293,48\"}]"} {"title":"Kinetic energy of the object after the work is done on it","description":"Correct!","type":"correct","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"150,5,187,48\"}]"}

Review

This says that if an object starts at rest so that its initial kinetic energy \(K_{\mathrm{i}}\) is zero, the more work the net force on an object does, the greater the final kinetic energy \(K_{\mathrm{f}}\) of the object. In principle, there is no limit to how much kinetic energy an object can acquire.