PHYS
Prelim1_Spring_06

• Notes
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Your Name SHORT ANSWER [37 points] Only the answer will be graded. You do not need to show any work. For multiple choice, please mark letters of your answers in spaces provided. 1. [3 points] A team of P112 students is bouncing a beach ball [of mass m=0.200 kg] in the lab, taking position data with a sonar ranger. Their computer calculates a graph of velocity versus time. They analyze this graph for the time interval between the first two bounces. For illustration, the graph is shown here. The velocity and slope of the v-t graph at the three marked points are: (1) ball rising v = 2.0 m/s slope = a 1 = - 8.1 m/s 2 (2) v = 0 slope = a 2 = - 7.2 m/s 2 (3) ball falling v = - 2.0 m/s slope = a 3 = - 6.4 m/s 2 Based on these data, what is the direction of the sum of all forces other than gravity, F other , at times (1), (2), and (3)? In the spaces below mark the letter corresponding to the direction. (A) (E) (F) F other =0 (a) At time (1) the direction of F other corresponds to letter ___________ (b) At time (2) the direction of F other corresponds to letter ___________ (c) At time (3) the direction of F other corresponds to letter ___________ 2. [5 points] Using the data from question #1, calculate the magnitude of the air drag force acting on the ball at point #1. Answer: ________________ N 0 t v (t) y 1 2 3

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Your Name 2 3. [6 points] A Hand pushes horizontally on block A. Block A is stacked on top of block B, which sits on a level floor. There is friction between each surface. Block B moves to the right ( ) with constant velocity . Block A is accelerating to the right ( ). (a) How does the magnitude of the friction force due to B on A compare with the magnitude of the friction force due to A on B? (A) f B on A > f A on B (B) f B on A < f A on B (C) f B on A = f A on B (D) This can't be determined here. Answer: (b) How does the magnitude of the friction force due to A on B compare with the magnitude of the friction force due to the floor on B? (A) f Floor on B > f A on B (B) f Floor on B < f A on B (C) f Floor on B = f A on B (D) This can't be determined here. Answer: (c) Which arrow best describes the direction of the friction force due to A on B?
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