AP PHYSICS C: MECHANICS 2015 SCORING GUIDELINES
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1 AP PHYSICS C: MECHANICS 015 SCORING GUIDELINES Question 1 15 points total Distribution of points (a) i. s Using Newton s second law with down the incline as the positive direction Fnet = ma mg sinq = ma For a correct expression of a positive acceleration a = gsinq ii. points Using a correct kinematics equation to solve for velocity v = v1 + at For substitution into a correct kinematics equation consistent with the acceleration from part (a)i For having a negative sign on v 0 v =- v0 + ( gsinq) t iii. s Using a correct kinematics equation to solve for position 1 x = x0 + v1t + at For substitution into a correct kinematics equation consistent with expressions from parts (a)i and (a)ii 1 x = D - v0t + ( gsinq) t (b) points Using an equation that can be solved for the closest position to the sensor v = v1 + ad For substitution into a correct kinematic equation consistent with part (a) For setting v to zero and using D for the initial position 0 = v + ( gsinq)( x - D) 0 0 v x = D - g sinq 015 The College Board.
2 AP PHYSICS C: MECHANICS 015 SCORING GUIDELINES (b) (continued) Question 1 (continued) Distribution of points Alternate solution: Using a conservation of energy approach to find the highest point the cart moves along the incline K + U = K + U 1 g1 g K1 = U g Alternate points 1 mv 0 mgh For using the correct energy statement with the correct initial velocity For a correct statement of the height of the cart along the incline h = ( D - x)sinq 1 0 ( )( sin ) v = g D - x q 0 v x = D - g sinq (c) 4 points For a position graph that is a parabola that does not cross the t-axis and has a vertex that does not touch the t-axis For a velocity graph that is a straight line and crosses the t-axis For an acceleration graph that is a horizontal line For a set of graphs that are consistent with each other 015 The College Board.
3 AP PHYSICS C: MECHANICS 015 SCORING GUIDELINES (d) points Question 1 (continued) Distribution of points Using an equation that can be solved for the distance v = v1 + ad For a correct expression of the frictional force f =- m mg = ma k a =- m g k 0 0 = v - m k gd For a correct answer v0 d = m k g Alternate solution: Alternate points Using an equation that can be solved for the distance 1 Fd = m ( v - v1) For a correct expression of the frictional force - m 1 k mgd ( 0 0 ) For a correct answer d = v0 m k g (e) 3 points The graph has two straight line portions. For having a change in slope at v = 0 For having slope values of each segment that have the same sign and the correct relative magnitudes (segment I slope magnitude greater than segment II slope magnitude, as shown in the graph above) For having a graph that crosses the t-axis earlier than t f and extends to t f 015 The College Board.
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13 AP PHYSICS C: MECHANICS 015 SCORING COMMENTARY Question 1 Overview The question required kinematics, Newton s laws, and energy considerations to describe the motion of a block on an inclined plane with friction, using equations and a graph. Sample: MQ1 A Score: 15 The solutions in this full-credit response are clear and well organized. In part (a) the student correctly uses calculus derivations instead of beginning with standard kinematics equations. In part (b) the equations derived in the previous two parts are correctly used to arrive at the answer. Sample: MQ1 B Score: 10 Parts (a)(i), (a)(ii), and (a)(iii) of this response earned the full 4 points. All of the responses are completely correct. Part (b) of this response also earned the full points credit. Part (c) only earned points. The position graph appears to be more of a trigonometric function (sine or cosine) at the edges of the curve, which resulted in losing the point for that graph. Since this graph cannot lead to linear graphs for velocity and acceleration, the point for consistency between all three graphs was also not earned. Part (d) of this response earned both points. Part (e) did not earn any points, since the sketch does not have two linear segments of different slopes, and it crosses the time axis at t f/. Sample: MQ1 C Score: 5 Part (a)(i) of this response earned. Part (a)(ii) also earned. The correct kinematic expression is used and the acceleration value from part (a)(i) is substituted into the expression, however, the sign on the initial velocity is not correct. Part (a)(iii) of this response did earn. The expression from (a)(ii) is correctly used, and the initial position D is noted. Part (b) earned no points. Part (c) earned points. The position and velocity graphs earned credit. However, the points for the acceleration graph and consistency were not earned. Part (d) of this response earned no points. The response begins by analyzing using friction, but the response does not have enough evidence of writing a correct expression for frictional force with the symbols required by the prompt. Part (e) of this response is blank and earned no points. 015 The College Board.
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