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Unformatted text preview: Copyright by Holt, Rinehart and Winston. All rights reserved. Chapter 5 Work and Energy Energy of a falling 75g Egg 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.00 0.10 0.20 0.30 0.40 Time (sec) Energy (J) PEg (J) KE (J) ME (J) Copyright by Holt, Rinehart and Winston. All rights reserved. Concept Check - Work Is it possible to do work on an object that remains at rest? 1. yes 2. no Copyright by Holt, Rinehart and Winston. All rights reserved. Concept Check - Work Is it possible to do work on an object that remains at rest? 1. yes 2. no Work requires that a force acts over a distance force acts over a distance . If an object does not move at all, there is no displacement no displacement , and therefore no work done no work done . Copyright by Holt, Rinehart and Winston. All rights reserved. Work Copyright by Holt, Rinehart and Winston. All rights reserved. Concept Check Play Ball!! In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball? 1. catcher has done positive work 2. catcher has done negative work 1. catcher has done zero work Copyright by Holt, Rinehart and Winston. All rights reserved. Concept Check Play Ball!! In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball? 1. catcher has done positive work 2. catcher has done negative work 1. catcher has done zero work The force exerted by the catcher is opposite opposite in direction to the in direction to the displacement of the ball, so the work is negative displacement of the ball, so the work is negative . Or using the definition ....
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