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Published byMilo Colin Lester Modified over 9 years ago
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Chapter 5: Work, Power, and Energy Chapter 5-1 (p. 168-171) Physics
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There are two types of work 1. Everyday sense “I work at McDonald’s.” “It is hard work to think this much.”
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There are two types of work. 2. Scientific sense Work – a force that causes a change in motion (force across a distance) Example – pushing a car or riding a bike
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Calculating Work - Work = force applied across a distance W = Fd(cos θ) W = work measured in Joules F = force measured in Newtons d = displacement measured in meters
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θ = angle between force and displacement - if θ = 0 then cos θ = 1 - if θ = 90 then cos θ = 0
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Units of work - Work is measured in Joules (J) 1 Joule = 1 Newton x 1 meter 1 J = work of lifting an apple from your waist to the top of your head
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- The SI units for work are named for James Prescott Joule (1818-1889), a British physicist who did much research in the area of energyJames Prescott Joule
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Positive or Negative Work - Since work is dependent on displacement, and displacement is directional, therefore work is directional.
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Positive or Negative Work Work can be a positive or negative depending on the direction of applied force in relation to displacement of the object.
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