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ch6 question3

Physics: Principles with Applications

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http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=6qu3&id=489216 Chapter 6, Question 3 Question Problem A normal force on an object can NEVER do work. The reason is that the normal force is always perpendicular to the contact surface, but the displacement is always tangential to the contact
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Unformatted text preview: surface. Therefore, the normal force is always perpendicular to the (instantaneous) displacement; it cannot do any work. http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=6qu3&id=489216 [2/4/2008 4:39:05 PM]...
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