Class 12 - 1 Problems in Dynamics Physics 1301, Fall 2011:...

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Unformatted text preview: 1 Problems in Dynamics Physics 1301, Fall 2011: Class 12 Wednesday, September 28, 2011 2 Objectives: Wednesday, September 28 Problems applying Newtons frst two laws Free body diagrams Weights, springs and strings 3 Demonstrations 1f20.33 Inertia cylinder 1f20.51 Shifted PASCO track inertia 1f30.10 Persistence of motion 1f30.30 Car on cart on cart 4 Three forces act on an object. In which direction does the object accelerate? 5 Three forces act on an object. In which direction does the object accelerate? 6 Question An object is held in place by friction on an inclined surface. The angle of the surface to the horizontal is increased until the object just begins to slide. If the surface is kept at this angle, the object (a) slows down (b) moves at a uniform speed (c) speeds up (d) none of the above 7 Answer The object begins to slide because the component of gravity along the plane exceeds the force of friction. Since the coefFcient of static friction usually exceeds the coefFcient of kinetic friction, the object speeds up 8...
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This note was uploaded on 11/10/2011 for the course PHYS 1301W taught by Professor Marshak during the Fall '08 term at Minnesota.

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Class 12 - 1 Problems in Dynamics Physics 1301, Fall 2011:...

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