# lo8 - PH 1110 A Term 2007 Lecture 8 Kinematics Dynamics...

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PH 1110, A Term 2007, Lecture 8 Kinematics Dynamics Work and Energy r, v, a →∑ F = m a W tot = K Definition of work, W = F·s Definition of kinetic energy, K = ½ mv 2 Work-energy theorem, W tot = K •P u z z l e r s Reminders

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Puzzlers: Is the work positive, negative, or zero for the following combinations of forces and displacements? 1. Positive 2. Negative 3. Zero 4. Not enough information A. Force , displacement B. Force , displacement C. Force , displacement D. Force , displacement E. Force , displacement
Puzzler: Is the total work positive, negative, or zero for an object with this free-body diagram? 1. Positive 2. Negative 3. Zero 4. Not enough information

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1. Positive 2. Negative 3. Zero 4. Not enough information s Puzzler: Is the total work positive, negative, or zero for an object with this free-body diagram?
1. No change 2. A factor of two 3. A factor of four 4. A factor of six 5. A factor of eight Puzzlers:

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lo8 - PH 1110 A Term 2007 Lecture 8 Kinematics Dynamics...

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