Lec09_Sum_f - Summary Lecture 9 Grades Average grade for...

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1 Lecture 9 Work Kinetic Energy Potential Energy Physics 111, Summer 2011, June 28, Lecture 9 Summary Grades High grades: >100 pts (4 students) Average grade for this exam: ~69 out of 110 points Low grades: <50 pts (4 students) Problems The most “difficult” problems: #13, 14, 16, 19 (<50%) The most “easy” problems: #2, 17, 24, 25 (>90%) 2 What we can expect if someone for the first exam received “F”? Future What can expect someone who received “low” grade? You can get very good grade but you have to work more! Physics 111, Summer 2011, June 28, Lecture 9 1. Distance [ meter (m) ] Mechanics and Dynamics: Summary and Next 2. Time [ second (s) ] 3. Mass [kilogram (kg) ] 4. Speed [ m/s ] 5. Velocity [ m/s and direction ] 6. Acceleration [ m/s 2 ] 7. Force [ newton (N) ] 8. Work [ joule (J) ] 3 11. Linear momentum [ kg·m/s ] 10. Power [ watt (J/s) ] 9. Energy [ joule (J) ] 12. Impulse [ kg·m/s ] Physics 111, Summer 2011, June 28, Lecture 9 Work, Energy, Power Work: Shows the result when the force acts on the object and this object is moved at some distance parallel to the force. Kinetic Energy : Due to motion, only moving objects have the kinetic energy. Potential Energy : Due to an object’s position or orientation (gravitational energy, elastic Energy: The measure of a system’s capacity to do work. 4 jp ( g g y , energy, electric energy, etc.). Power: The time rate of doing work. Physics 111, Summer 2011, June 28, Lecture 9
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2 Work: Force and Distance When a constant force acts on the object in the same direction as its motion, the work done on an object by external force is: work = (force) x (distance parallel to force) k F F Direction of motion d F W work II = = d (distance) x
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Lec09_Sum_f - Summary Lecture 9 Grades Average grade for...

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