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EM SCORE 28 32 32 41 TOTAL SCORE / 100 30 /163 = Name PROBLEM 1A (20 pts) A box of mass m = 20 kg is at F. as shown in the figure. g is at rest on a rough surface. You push it horizontally with a force FA (A) (4 pts) You push the block with F4 = 65 N, and the block accelerates with a = 2 mis What is the coefficient of kinetic friction ? Hint: Draw a free body diagram. Coefficient = (B) (8 pts) When you push the block with FA = 30 N, it remains at rest. What is the force of static friction on the block? A free body diagram must be included for full credit. Static friction = ()(4 pts) The minimum force required to get the block to move is FA = 60 N. What is the coefficient of static friction. Coefficient = (D) (4 pts) Suppose the block is pushed at an angle below the horizontal as shown. Compared to FA when the block is pushed horizontally : (a) Kinetic friction increases because the vertical component of FA increases the normal force (b ) Kinetic friction decreases because the vertical component of FA increases the normal force (c) Kinetic friction increases because the vertical component of FA decreases the normal force (d) Kinetic friction decreases because the vertical component of FA decreases the normal force PROBLEM 1B (8 pts) A cannonball shot vertically upwards reaches a maximum height of 50 m. On the coordinate axes below, plot the height, velocity, and acceleration of the cannonball as a function of time from when it is released until it returns to the release point (make that y = 0 m). The dotted lines in the graphs indicate the time when the cannonball is at its maximum height