2014年AP物理考试真题答案下载

　　下面介绍的是2014年AP物理考试真题答案下载，建议大家在线下载完整版2014年AP物理考试真题PDF格式，小马过河祝大家都能取得优异成绩。

　　2014年AP物理考试真题部分内容如下：

　　2

　　AP® PHYSICS C: MECHANICS 2001 SCORING GUIDELINES Question 1

　　15 points total 1. (a) 6 points Distribution of Points 1 point

　　The average acceleration is the change in velocity divided by the time interval For correct subtraction to find the time interval

　　∆t = t f − ti = 0.37 − 0.33 = 0.04 s

　　From graph: υi = 0.22 m s For getting υi in the range 0.2 < υi ≤ 0.25 m s From graph: υ f = −0.18 m s For getting υ f in the range −0.15 ≥ υ f > −0.20 m s For getting ∆υ consistent with the student’s values of υi and υ f , including subtracting in the correct direction

　　1 point 1 point 1 point

　　∆υ = υ f − υi = −0.18 m s − 0.22 m s = −0.40 m s

　　a=

　　∆υ −0.4 m s = ∆t 0.04 s

　　1 point 1 point

　　2

　　For correct substitution of values in the above equation

　　a = −10 m s

　　For showing deceleration (e.g., with a minus sign)

　　Note: There were three alternate methods for solving parts (b) and (c) that could receive full credit. Method 1. 1. (b) 3 points 1 point

　　For any indication of the concept of finding the area under the curve in the second graph

　　∆p = ò F dt or ∆ p = the area under the F vs. t curve

　　∆p = 0.6 N • s or ∆p = 0.6

　　kg • m s

　　For correct numerical value of 0.6 For correct units 1. (c) 2 points

　　1 point 1 point

　　For any statement of the correct equation for the change in momentum

　　∆p = m∆υ m=

　　1 point 1 point

　　For correct substitution of values consistent with those obtained above

　　∆p 0.6 N s = = 1.5 kg ∆υ 0.4 m s

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