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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 Newton’s 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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Class 12 - 1 Problems in Dynamics Physics 1301 Fall 2011...

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