Work and Kinetic Energy-2

# Work and Kinetic Energy-2 - Work and Kinetic Energy

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Work and Kinetic Energy PHYS-116A-02, 9/23/10, Lecture 9 Momchil Velkovsky

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Consider the vectors shown. What is the dot product C . D ? 0% 0% 0% 0% 0% A. (120 m2 ) cos 78.0° B. (120 m2 ) sin 78.0° C. (120 m2 ) cos 62.0°  D. (120 m2 ) sin 62.0° E. none of these
Consider the two vectors What is the dot product ˆ ˆ A = 3i + 4j ˆ ˆ B = 8i + 6j - r r 0% 0% 0% 0% 0% A B? r r A. zero B. 14 C. 48 D. 50 E. none of these

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Work, a force through a distance As in the illustration, pushing in the same direction that  the object moves
Use the parallel component if the force acts at an angle

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How can it be such a great “workout” with no work? When positive and negative work cancel, the net work is zero even though muscles are exercising. g The work that gravity F does on the barbell is g g W F s mg y = • = r r
Stepwise solution of work done by several forces

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A 6.00-kg block and an 8.00-kg block are connected as shown. When released, the 6.00-kg block accelerates downward and the 8.00-kg block accelerates to the right. After each block has moved 2.00 cm, gravity has done 1 2 3 4 0% 0% 0% 0% A. more work on the 8.00-kg
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## This note was uploaded on 11/12/2010 for the course PHYSICS PHYS 116A taught by Professor Velkovsky during the Fall '09 term at Vanderbilt.

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Work and Kinetic Energy-2 - Work and Kinetic Energy

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