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-55880-12700Work00Work Seed Question: How much work is done by you on the heavy granite boulder in holding it 1.0 m off the ground for 60 seconds?A) A lotB) A littleC) NoneExploration: By definition, W=F?d2171700308609θ is the angle between the force F and displacement d vectors when placed tail-to-tail.00θ is the angle between the force F and displacement d vectors when placed tail-to-tail.1. How much work do you do in carrying a 50 kg box 3.0 m horizontally, at a constant velocity? Sketch it, only drawing the force you exert on the crate.2. How much work do you do if you tilt the box at 30o while carrying the 50 kg box 3.0 m horizontally with constant velocity? Sketch it, again only drawing one force on the crate.3. How much work do you do in lifting a block of mass m up a height h, with a slow, constant velocity? Sketch it!Bottom of page4. How much work do you do in holding a block of mass m at a constant distance from the floor of an elevator that moves up a distance h, with a slow, constant velocity? Sketch it!5. How much work does gravity do in lifting a block of mass m up a height h? (Does the velocity need to be slow and constant?) Sketch it!Big Idea:2601595100965Notes: Draw object in the initial and final positions. Only draw one force the one that does the work you are interested in.Put F and d vectors tail-to-tail and indicate θ on the diagram.00Notes: Draw object in the initial and final positions. Only draw one force the one that does the work you are interested in.Put F and d vectors tail-to-tail and indicate θ on the diagram.11912605286800Work W=Fcosθd521335147955Component of F // to d00Component of F // to dBy Def: W=Fdcosθ510921074930Work W is a Scalar: it has no direction!00Work W is a Scalar: it has no direction!259207085090Units of Work: 1 J = 1 Nm1 Joule = 1 Newton meter00Units of Work: 1 J = 1 Nm1 Joule = 1 Newton meter-215265169545005091430160020Work W can be +,- or 0.00Work W can be +,- or 0.Discussion: ? ................
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