Physics 6A Practice Final fall 2009

# Physics 6A Practice Final fall 2009 - Physics 6A Practice...

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Physics 6A Practice Final Problems Solutions posted at www.clas.ucsb.edu/staff/vince 1) A locomotive engine of mass M is attached to 5 train cars, each of mass M. The engine produces a constant force that moves the train forward at acceleration a. If 3 of the cars are removed, what will be the acceleration of the shorter train? a) 0.5a b) 1.7a c) 2.0a d) 3.0a 2) Two boxes are placed next to each other on a smooth flat surface. Box A has mass 1 kg and Box B has mass 3 kg. A constant horizontal force of 8 N is applied to Box A. Find the force exerted on Box B. 3) Two boxes are placed next to each other on a flat surface. Box A has mass 1 kg and Box B has mass 3 kg. The coefficients of friction are 0.3 and 0.4 for kinetic and static friction, respectively. A constant horizontal force of 8 N is applied. Find the acceleration of Box B. a) 0 m/s 2 b) 1 m/s 2 c) 2 m/s 2 d) 3 m/s 2 4) A 0.2 kg piece of wood is being held in place against a vertical wall by a horizontal force of 5 N. Find the magnitude of the friction force acting on the wood. 5) A 4 kg block on a horizontal surface is attached to a spring with a force constant of 50 N/m. As the spring and block are pulled forward at constant speed, the spring stretches by 25 cm. Find the coefficient of kinetic friction between the block and the table. a) 0.25 b) 0.32 c) 0.42 d) 0.51 6) A 90 kg man drives his car at a constant speed of 15 m/s over a small hill that has a circular cross section of radius 40 m. Find his apparent weight as he crests the top of the hill. 15 m/s 40 m 5N a) 1 N b) 2 N c) 5 N d) 10 N A B a) 1 N b) 2 N c) 4 N d) 6 N

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Physics 6A Practice Final Problems Solutions posted at www.clas.ucsb.edu/staff/vince
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