AP PHYSICS C: MECHANICS 2013 SCORING GUIDELINES
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1 AP PHYSICS C: MECHANICS 2013 SCORING GUIDELINES Question 1 15 points total Distribution of points (a) 3 points For labeling the axes with appropriate values For a smooth curve that begins with increasing u and is concave down For a horizontal line near u 0.50 m s, beginning between t = 0.79 and 1.0 s (b) i. For a correct method of plotting position x as a function of time t Examples Plot the area under the velocity curve from part (a) as a function of time. x udt The slope of x as a function of t would yield the u versus t graph in part (a) The College Board.
2 AP PHYSICS C: MECHANICS 2013 SCORING GUIDELINES Question 1 (continued) ii. 3 points Distribution of points For a smooth curve that begins with increasing x and is concave up for t 0.79 s, ending between t 0.79 s and 1.0 s For a straight line with a positive slope, beginning between t 0.79 s and 1.0 s For a smooth transition of the curve from non-linear to linear in the region between t 0.79 s and 1.0 s (c) 3 points For using the graph to determine the distance traveled during the first part of the motion, beginning at t 0 and ending somewhere between 0.79 s (when the glider and spring lose contact) and 2 s (the maximum time shown on the velocity graph For calculating using the graph between 0 and 1.0 s, d1 (2.9 large grid squares)(0.125 m square) 0.36 m (1 square = 0.25 m/s 0.5 s = m) For a correct expression indicating constant velocity during the last part of the motion d2 udt u( t 1.0 s) For adding the two distances and solving for the time at which the glider hits the bumper d1 d2 2.0 m 0.36 m 0.50 m s ( t 1.0 s) 2.0 m ( ) m t 1.0 s 4.3 s 0.50 m s 2013 The College Board.
3 AP PHYSICS C: MECHANICS 2013 SCORING GUIDELINES Question 1 (continued) Distribution of points Alternate Solution For using the given information about the spring compression and the time at which the glider loses contact with the spring to arrive at t s at d m d2 2.0 m 0.25 m 1.75 m For a correct expression indicating constant velocity during the last part of the motion t2 d2 u 1.75 m 0.50 m s 3.5 s For adding the two times t t1 t s 3.5 s t t1 t s Alternate Points (d) 2 points For a correct expression of conservation of energy in terms of the spring constant k and the velocity u U K S1 2 1 kx k mu2 m 2 u u2 2 2 x m x m k 0.40 kg 0.50 m s 2 For a correct answer, with correct units k 1.6 N m 2013 The College Board.
4 AP PHYSICS C: MECHANICS 2013 SCORING GUIDELINES Question 1 (continued) (e) i. For the correct amplitude x 0.25 m m Distribution of points ii. 2 points For some work that uses a correct expression for the period of a spring m T 2p k For correct substitution of consistent values 0.40 kg T 2p 3.1 s 1.6 N m Alternate Solution For recognizing that the 0.79 s of contact time is one quarter of a period Alternate Points For giving the period as four times the contact time T s 3.2 s 2013 The College Board.
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17 AP PHYSICS C: MECHANICS 2013 SCORING COMMENTARY Overview Question 1 This question analyzed and interpreted simple harmonic motion with a variable force by graphical and analytical methods. Part (a) graphs the given data. Part (b)(i) describes how to determine the position-time graph from the graph/data in part (a). Part (b)(ii) is a sketch of the position as a function of time. Part (c) calculates the total time for both the accelerated motion and the constant velocity portion of the motion. Part (d) calculates the spring force constant. Part (e)(i) determines the amplitude of oscillation. Part (e)(ii) calculates the period of oscillation. Sample: M1-A Score: 13 Full credit was earned in part (a) for an exemplary graph. Full credit was also earned in part (b)(i) for a well described method for plotting position versus time. A correctly sketched graph of glider position versus time earned full credit in part (b)(ii). The student earned in part (c) for using constant velocity and determining the time for the cart to move from the end of the spring to the bumper at the 2 meter mark. The time interval during glider contact with spring was not determined and the total time was not calculated. The correct calculation of force constant with proper units earned full credit in part (d). Part (e)(i) earned full credit for realizing that the original displacement is equal to the amplitude. Part (e)(ii) earned full credit for correct calculation of the period. Sample: M1-B Score: 8 Part (a) earned two points for the correct axis scale and for the smooth curve with increasing velocity. The horizontal line is not a best fit with the data plotted. It should be closer to u 0.5 m s. Part (b)(i) earned full credit for a correct method for plotting a graph of position versus time. Part (b)(ii) earned for the constant velocity segment of the graph and for the smooth transition from accelerated to non-accelerated motion near 0.79 seconds. The first portion of the graph representing the accelerated motion was drawn incorrectly. No credit was earned in part (c) for assuming constant velocity during the entire motion of the glider. Part (d) earned full credit for a correct calculation of the spring constant with proper units. Part (e)(i) earned full credit for the determination of the amplitude. No credit was earned in part (e). Sample: M1-C Score: 3 Part (a) earned for the correct axis scale. The second data point was incorrectly plotted and no credit was earned for the smooth curve illustrating the increasing velocity of the glider. The dot-to-dot nature of the curve for the constant velocity portion of the motion does not accurately reflect a best fit. Part (b)(i) earned full credit for a correct method of plotting a graph of position versus time. Part (b)(ii) earned 1 point for a curve representing the position of the glider during the accelerated portion of the motion. The horizontal line does not earn credit, as the glider leaves the spring with a constant velocity. The smooth transition does not occur near the 0.79 second time when the glider left contact with the spring. Part (c) is blank. Part (d) earned no credit for using an incorrect method of calculating the spring constant. Part (e)(i) earned no credit for incorrectly determining the amplitude. Part (e)(ii) earned no credit for attempting to use the period of a pendulum equation for a spring problem The College Board.
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