<![CDATA[The aim of this research was to see concept of vector addition mastery and students’ achievement in circulation motion and constant speed subject at the tenth grade students of SMA Negeri 5 Padangsidimpuan. This research used descriptive method to see the general picture variables X and Y, and correlation method to examine the relationship or significant of these two variables. The population of this research was all the tenth grade students of SMA Negeri 5 Padangsidimpuan. They were 170 students or 6 classes. Sample was taken by using Taro Yamena formulate of random technique sampling which include 63 students. In collecting the data, the writer used test. The average of concept of vector addition mastry was 77. It was categorized “good”. While the average of circulation motion and constant speed subject was 75. It was categorized “good”. The hypothesis was accepted based inferential statistics analysis by using ttest formulation. Based on calculation, it could be gotten that rcount =0.75, and rtable = 0.248 in error level 5%, confidence level 95%, and df = N-1=61. Based on the calculation above, it could be seen that r0 was greater than rtable (0.75>0.248). Determination Coefisien: D=(rxy)2 = 0.5625. It was categorized “medium”. Where tcount = 8.86 and ttable = 1.67, in error level 5%, confidence level 95%, df = N-2=61. Based on the calculation above, it could be seen that tcount was greater than ttable (8.86>1.67). It means the hypothesis was accepted. In the other words, there was a significant influence concept of vector addition mastery on students’ achievement in circulation motion and constant speed subject at the tenth grade students of SMA Negeri 5 Padangsidimpuan.]]>
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