# Lecture-10 - Work WorkandEnergy Lecture#10 Ch.6.1 6.3...

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ork and Energy Work and Energy Lecture #10 – Ch. 6.1 – 6.3 Physics 125–Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Work – Definition () The Work W done by a (vector) force F is a SCALAR quantity ual to the product between the magnitu e of the force F the G G equal to the product between the magnitude of the force F , the magnitude of the (vector) displacement s and the cosine of the G angle between the two vectors. F s c o s F s c o s = G G ( ) ( ) WF s cos θθ ==
Work – Particular Cases Depending on the angle , here are 4 particular cases: θ G () ( ) ( ) Case 1: 0 , cos 0 1, W 0 F s cos 0 F s. °= F s G G ( ) Case 2: 90 , cos 90 0, W +90 F s cos +90 0. = ° F s G Case 3: 180 , cos 180 W 180 ° = ° = F s cos 180 F s. °=− F G G Case 4: 90 270 , cos 90 W 90 F s cos 90 0. =− ° ° − ° = s s G ( ) ( ) ( ) ( ) ,, F G

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Net Work Forces or Components of Forces which are parallel to the ector) displacement will generate NONZ RO Work (vector) displacement will generate NONZERO Work.
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Lecture-10 - Work WorkandEnergy Lecture#10 Ch.6.1 6.3...

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