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Newtons+Laws+II - NEWTONS LAWS II WORKSHEET 1 A 50-kg block...

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NEWTON’S LAWS II WORKSHEET 1. A 50-kg block rests on a horizontal surface. The coefficient of static friction µ s = 0.50. The coefficient of kinetic friction µ k = 0.35. A force of 250 N is applied as shown. A) The block remains at rest. B) The block moves and continues to move at constant velocity. C) The block accelerates to the right. D) The block does not move until is increased to greater than 490 N. E) No conclusions can be drawn concerning the movement of the block from the information given. 2. Four identical blocks are moving on a surface for which the coefficient of kinetic friction between each block and the surface is µ k . The velocity of each block is indicated by the vector on the block. For which block is the force of friction between the surface and the block greatest? A) 1 B) 2 C) 3 D) 4 E) The force of friction is the same for all blocks. 3. Two objects are sliding at the same speed across a wooden surface. The coefficient of kinetic friction between the first object and the surface is twice that between the second object and the surface.
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