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L22 - Remember:ThisWeek...

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Remember: This Week Read Ch. 6 (Work & Energy): 6.1, 6.3, 6.4, 6.5, 6.6. Tutorial 4 : Work & Energy. Print and bring to your Lab SecEon. CAPA assignment #8 is due Friday evening at 10 PM, to be done on‐line. L22 W 3/3/10 1 Physics 2010

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L22 W 3/3/10 Physics 2010 2 Ch. 6 Energy What’s Energy? – hard to define, comes in many forms Definition: Energy is the ability to do “Work” . Whenever work is being done, energy is being changed from one form to another or being transferred from one body to another. The amount of work done on a system (or by a system) is the change in energy of the system. Energy is such a useful concept because it is “ Conserved” .
L22 W 3/3/10 Physics 2010 3 Ch. 6 Energy To understand energy, its interconversion to different forms, and its conservation, we must first define some terms: Work Kinetic Energy (KE) “Work-Energy Principle” Potential Energy (PE) What’s Energy? – hard to define, comes in many forms

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L22 W 3/3/10 Physics 2010 4 Work new unit
L22 W 3/3/10 Physics 2010 5 Work Note: Work is a scalar (not a vector), but it does have a sign. When the component of force in the direction of displacement points along the displacement, Work is positive . When the force is perpendicular to the displacement, Work is zero . When the component of force in the direction of displacement points oppositive to displacement, Work is negative .

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L22 W 3/3/10 Physics 2010 6 Work Example 1. Consider an object displaced Δ x = 1 m at a constant speed on a rough table by a constant external force F = 10 N.
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