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Physics 6A Practice Midterm2 fall 2010

# Physics 6A Practice Midterm2 fall 2010 - Physics 6A...

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Physics 6A Practice Midterm #2 solutions posted at 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 crate filled with books rests on a horizontal floor. The total weight of the crate and books is 700 N. The coefficients of friction are 0.35 for kinetic and 0.45 for

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Physics 6A Practice Midterm2 fall 2010 - Physics 6A...

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