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g6 - Work(in Physics In Physics Work is defined as W = FA d...

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Work (in Physics) In Physics Work is defined as W = F A d cos θ c circlecopyrt L.Frommhold . – p.21/21

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No Work, but (Lots of) Sweat ? A person standing at the bus stop may get tired, but he is doing no Work , W = F A d cos θ because d = 0 . Even if he were walking home, W = 0 , because of cos θ = 0 . c circlecopyrt L.Frommhold . – p.20/21
Units of Work Work done on an object by a constant force is the product of displacement and the component of the force parallel to the displacement, W = F bardbl d = ( F cos θ ) d θ is the angle between force vector F and displacement vector d . Work is measured in units of N · m, or Joule (J). Other units are erg and ft · lb; 1 Joule = 10 7 erg = 0.7376 ft · lb Work is typically done by an “agent”, or a motor,. . . c circlecopyrt L.Frommhold . – p.19/21

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Example 6-1 The net force is given by vector F net = vector F agent + vector F fr + vector F G + vector F N x component: F x , net = F agent cos θ - F x , fr y component: F y , net = F agent sin θ - m g + F N Work W = F agent cos θ · Δ x c circlecopyrt L.Frommhold . – p.18/21
Mountain Climber A mountain climber does work by lifting his weight to the top of the mountain, vector F agent + vector F G = 0 Note that vector F agent is vertical so that W = F agent d cos θ = m g h A person (m=100 kg) climbs a mountain (2000 m high) does work W = 100 kg · g · 2000 m 2 · 10 6 J c circlecopyrt L.Frommhold . – p.17/21

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g6 - Work(in Physics In Physics Work is defined as W = FA d...

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