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Name: ________________________ Midterm--PHYS 203-1R--Fall 2011 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. What is the measurement given by this caliper, in centimeters? ____ a. 0.780 cm c. b. 7.000 cm d. 2. For this graph, what are the units of the slope? a. b. m/s m/s3 c. d. 1 0.880 cm 0.65 cm m/s2 s/m ____ 3. This graph represents the position of a particle over a time of five seconds. What is the particle’s instantaneous velocity at t=0.75 seconds? ____ a. 4 m/s c. -2 m/s b. 1 m/s d. 0 m/s 4. The following are 2 vectors. Which figure best represents the difference A+B=C a. c. b. d. 2 ____ 5. You drop a bouncy ball on the floor, and it bounces back up to your hand. Which of these plots best describes the motion of the ball from the moment you release it to the moment you catch it? a. c. b. d. 3 Problem 6. What is the standard error in the following set of numbers: 13 7 11 9 . 7. Sketch the y-velocity versus time graph for a ball that is thrown upwards, goes up, and returns to its original position. . 4 8. Sketch the x- and y-components of the velocity for a ball that is kicked at some angle from ground level. The ball follows a parabolic path in projectile motion. Create separate plots for the x- and y-components of the velocity. . 5 9. Using trigonometry, calculate the sum of these two vectors. ä B = 5 N at 0 ο above the + x axis . 10. With the graphical method on a separate sheet of paper, show the magnitude and direction of the sum of the two vectors in the previous problem. Calculate the percent difference between the magnitude found here (the observed) and that calculated in the previous problem (the actual). Please label the scale you use to draw the vectors; use a scale so the vectors occupy >2/3 of the sheet of paper. Please have your paper be in landscape mode for drawing the vectors. % difference for magnitude=_____________% % difference for direction=_____________% . 6 11. A ball is launched from a spring-loaded gun as in this figure. The y-displacement is 0.9 meters. The x-displacement is 2.3 meters. What time passes before the ball strikes the ground? ______________ What is the initial velocity of the ball? ______________ At what height from the floor would you place a target placed 1 meter from the table? ______________ . 7 12. The following data was taken for an object undergoing constant acceleration. The relationship between the two quantities is as follows: Plot the data and interpret it to determine the acceleration of the object. ∆x (m) 1 2 3 4 v (m/s) 3.1 4.5 5.2 6.4 . 8 Other 13. Equations For Projectile Motion: Horizontal motion Vertical Motion v x = vo , x v y = vo, y + a y t x = vo, x t y = y o + vo, y t + 9 1 ayt 2 2 ID: A Midterm--PHYS 203-1R--Fall 2011 Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. ANS: ANS: ANS: ANS: ANS: C A A B D PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 PROBLEM 6. ANS: . PTS: 1 7. ANS: . PTS: 1 8. ANS: . PTS: 1 9. ANS: . PTS: 1 10. ANS: . PTS: 1 11. ANS: . PTS: 1 12. ANS: . PTS: 1 1 ID: A OTHER 13. ANS: . PTS: 1 2