Quiz2ForceworkAnswer - the box does not slide. Then, as the...

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AP1200 Quiz 2 1. Two water slides at a pool are shaped differently but start at the same height h. Two riders, rider 1 and rider 2, start from rest at the same time on different slides. (a) Which rider is traveling faster at the bottom? (b) Which rider makes it to the bottom first? Ignore friction. Answer (a) Each rider started from the same height and there was no friction forces involved, so the speed v at the bottom is the same. (b) Note the rider 2 is consistently at a lower elevation than rider 1 for the entire trip. This means rider 2 has converted his potential energy to kinetic energy earlier. Consequently, he is traveling faster than rider 1 for the whole trip. Rider 2 gets to the bottom first. 2. In the figure, horizontal force F 1 of magnitude 10 N is applied to a box on a floor, but
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Unformatted text preview: the box does not slide. Then, as the magnitude of vertically applied force F 2 is increased from zero but before the box begins to slide, do the following quantities increase, decrease, or stay the same: (a) the magnitude of the frictional force on the box (b) the magnitude of the normal force on the box from the floor (c) the maximum value f s,max of the static frictional force on the box? Answer: (a) The magnitude of the frictional force on the box will not change since the horizontal force F1 is not changed. (b) The magnitude of the normal force on the box decreases due to the increase of vertical force F2. (c) The magnitude of the normal force decreases so the maximum value f s,max of the static frictional force on the box decreases. F 1 F 2 Rider 2 Rider 1...
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This note was uploaded on 01/11/2011 for the course AP 1200 taught by Professor Michela.vanhove during the Spring '10 term at City University of Hong Kong.

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