The Correlation Study of Interest at Physics and Knowledge of Mathematics Basic Concepts towards the Ability to Solve Physics Problems of 7th Grade Students at Junior High School in Ambon Maluku Province, Indonesia
The purpose of the study is to determine the relation between interest at Physics and knowledge of Mathematics basic concepts with the ability to solve Physics problems. The populations are all students in the 7th grade at the junior high school in Ambon, Maluku, Indonesia. The used sample schools are Junior High Schools 8, 9, and 10 during 2013/2014 academic year with 44 students per school. Two independent variables and one dependent variable are studied. The independent variables are the interest at Physics (X1) and the knowledge of Mathematics basic concepts (X2), while the dependent variable is the ability to solve Physics problems (Y). Data collection technique for X1 is an interview with questionnaire instrument, while for the X2 and Y is using the test technique with test items instrument. The obtained data from the measurements were analyzed with descriptive analysis and inferential analysis. The results show that there is a positive relation between interest at Physics and knowledge of Mathematics basic concepts with students’ ability to solve Physics problems.
This quite makes sense, because Physics is part of science [3–5], where science has direct effects and relation to various life fields and also jobs based on information and technology [3, 6, 7]. Further,  states that almost every life fields have relation with Physics like organisms or inanimate, from Engineering to Mathematics, Biology, and Chemistry. According to , without Physics science knowledge, human will face difficulties in exploring the universe. Furthermore, [4, 8] stated that the understanding of Physics helps to understand the content of universe and, for students, it helps to develop the observation skill, accuracy, analysis ability, creative thinking, and Physics science acquisition which is now is very required and cannot be avoided by students .
Nevertheless, the student result study of Physics is still low in all levels  in junior high school level , or in senior high school level  as well as in higher education level . The low student study result of Physics is caused by many factors such as intern and extern factors from the students [11, 12]. The intern factors may be the attitude, motivation, interest, knowledge, skills, hope, assumption, and goals [11–15], while the extern factor is the student study environment condition [11, 12], like the utilization of teaching method by the teachers , family environment, and the availability of learning facility and infrastructure [13, 15–17].
One of the intern factors affecting the study achievement is student interest to the material taught. As mentioned in  if a student has high study interest, the study result tends to be high. In contrast, if the interest is less, the study result will be low.
The low of student result study in Physics so far, is also caused by Physics is considered as a difficult lesson for the students, especially if the materials are related to Mathematics calculation [3, 14]. On the other side, the Physics comprehension needs knowledge of Mathematics concepts. According to  there is a positive correlation between Mathematics acquisition and the success in Physics study result achievement. The relation between Mathematics acquisition and Physics study result is reported by many researchers. As reported in  one cause of student difficulty in studying Physics is the mathematic ability weakness. Also,  reports that there is a linear relation between the comprehension of Mathematics concept and the ability to solve Physics problems, while  states that student having high Mathematics ability has effects to student achievement of Physics study.
Learning Physics is also related with the ability to solve problems. According to  problem solving has important role in Physics learning. Further, it is stated that problem solving aims at developing the transformation skills including problem observation, proposing questions, formulating hypothesis, planning examination, conducting examination, analysis and data interpretation, and communicating the results.
The Physics study result of Junior High School students in Ambon, Maluku province, so far has not showed maximum result. On the other side, there is no research to know student interest at Physics and/or knowledge of student basic concept of Mathematics and its correlation to the Physics study result of Junior High School students in Ambon. This is because so far, the research is conducted separately by Mathematics and Physics researchers without considering the importance of these two combinations; instead according to , students’ Physics ability is affected by student experience in studying Mathematics. This shows that comprehension of Physics requires Mathematics acquisition. Besides, although it is known and as an open secret that interest, as well as the knowledge of Mathematics basic concept must be related to students’ ability to solve problems or students’ result study not only in Physics, but also other fields, but this kind of research has not been ever conducted to Junior High Schools 8, 9, and 10. However, to increase student study result of Physics, it is very necessary to require some factors affecting student study result like the interest at Physics and knowledge of Mathematics basic concept as the initial information for teacher to develop successful learning.
Based on this background, this research aims to know (1) the relation between interest at Physics and ability to solve Physics problems, (2) the relation between knowledge of Mathematics basic concept and ability to solve Physics problems, and (3) the collective relation between interest at Physics and knowledge of Mathematics basic concept and the ability to solve Physics problems for Junior High School students in Ambon.
This research uses survey method with ex-post-facto technique. The ex-post-facto research is conducted by taking samples from a population and using questionnaire as a tool for collecting data, so in this research, the researcher does not conduct any treatment or control to the research subjects but only reveals facts through existence symptom measurement to the respondents. The research variables are interest at Physics (X1) and knowledge of Mathematics basic concept (X2) as independent variables, while the dependent variable is the ability to solve Physics problems (Y) (Figure 1).
The school selection is conducted by purposive sample technique, namely, State Junior High Schools 8, 9, and 10. The research is conducted for 3 months in odd semester of 2013/2014 academic year. The research population is all students in 7th grade from those all schools. Because each school has different number of student, to uniform the sample number, it takes 44 students randomly, so the total sample number is 132 students consisting of 80 male students and 52 female students with the average age being 12-13 years. The selection of students as sample was used by random sampling technique.
The research instruments are two kinds that are questionnaire and test item. The questionnaire to measure independent variable of interest at Physics is 40 questions (obtained after validity test of 57 questions before validity test) referring to Likert scale with answer options being very agree, agree, doubt, disagree, and very disagree. The instrument of test problem question is to measure the independent variable of Mathematics basic concept knowledge (X2) is 30 questions (obtained after validity test of 43 items before validity test) with multiple choice questions referring to the concept: row, algebra operation, trigonometry, equation, and inequality. For dependent variable of problem solving in Physics, the 11 subjective test questions are used (obtained after validity test of 13 questions before validity test) and arranged based on the main material of time, distance, and speed. The questionnaire and test problem are developed by the researcher himself; both the validity and reliability also are tested.
The instrument validity test is conducted with the correlation formula of product-moment from Pearson. The criteria are valid with the value of at the significance level of α 0.05. The instrument reliability test is conducted by following Alpha Cronbach coefficient formula. As mentioned in  if the Alpha Cronbach value is >0.60, the questions to measure the observed variables have high reliability.
The procedure consisted of three stages. The first stage carried out preparation of research instrument which includes a questionnaire to measure the variables of interest at Physics and test items to measure the variable knowledge of Mathematics basic concepts and ability to solve Physics problems. The second stage is the analysis instrument that includes test validity and reliability. The third stage is the provision and implementation of test questionnaire to students.
From the result data of interest at Physics and knowledge of Mathematics basic concept, its normality and homogeneity are tested. The normality test uses Liliefors test to tyest two hypotheses, namely, H0: samples are from abnormal distribution population, and H1: samples are from normal distribution population. The criterion is normality if the samples are from normal distribution population.
The homogeneity test is conducted by following Bartlet method with chi square analysis technique testing two hypotheses, namely, H0: samples are from inhomogeneous population, and H1: samples are from homogeneous population. If the sample from normal distribution population is and homogeneous , it can be continued with hypothesis analysis.
To know the relation between independent and dependent variables , , and , the multiple correlation analysis is conducted using product-moment correlation. The results of multiple correlation analysis between independent and dependent variables are also tested its linearity to know whether the correlation is linear or not. This is by testing the research hypothesis significance by value measurement of regression coefficient to obtain regression equation. Then, the significance test of regression equation is conducted using variance analysis. The significance criteria of regression equation are if of 0.05 the regression equation is significant, whereas if , the regression equation is not significant. All the statistical analysis was done by using the Statistical Package for Social Sciences (SPSS) version 18.0 for Windows.
3. Results and Discussion
3.1. The Instrument Validity and Reliability Analysis Results of Independent and Dependent Variables
The instrument validity and reliability analysis results (Table 1) show that the used problem questions in this research are valid and reliable, both for the questionnaire for interest at Physics variable or test instrument for knowledge of Mathematics basic concept and ability to solve Physics problems variables.
3.2. The Normality and Homogeneity Analysis Results
Based on the normality and homogeneity calculation conducting to all 132 respondent data including the variables of interest at Physics, knowledge of Mathematics basic concept, and ability to solve Physics problems (Table 2), evidently, the samples are from normal and homogeneous distribution, so the multiple correlation analysis can be conducted to know the relation between independent and dependent variables.
3.3. The Multiple Correlation Analysis Results of Independent and Dependent Variables ; and
The multiple correlation analysis to the independent variable data of interest at Physics (X1), the knowledge of Mathematics basic concept (X2) also interest at Physics, and knowledge of Mathematics basic concept collectively with the ability to solve Physics problems (Y) are shown in Table 3.
The multiple correlation analyses of X1 variable to Y, X2 to Y, and X1, X2 to Y are conducted to test the zero hypothesis (H0) stating that there is no relation between interest at Physics, knowledge of Mathematics basic concept, and both collectively with the ability to solve Physics problems; and also alternative hypothesis (H1) is stating that there is relation between interest at Physics, knowledge of Mathematics basic concept, and also both collectively to problem solving ability in Physics, with the hypothesis acceptance criteria being if the calculation is bigger than r table, the is accepted, and is rejected, whereas if the calculation is bigger than r table () is accepted and is rejected.
In Table 3, it is shown that the variables of interest at Physics (X1), knowledge of Mathematics basic concept (X2), and also interest at Physics and knowledge of Mathematics basic concept collectively (X1, X2) show significant relation with the ability to solve Physics problems with the values of and , respectively, are: ( 3.60 > 1.65 to α 0.05), ( 4.54 > 1.65 to α 0.05), and ( 11.36 > 3.06 to α 0.05). These results cause the rejected of null hypothesis stating that there is no relation between interest at Physics and knowledge of Mathematics basic concept and also the combination of the two to the ability to solve Physics problems and knowledge of Mathematics basic concept, or the combination of the two to the ability to solve Physics problems.
3.4. The Significant Test of Research Hypothesis
The significant test of research hypothesis is conducted to the results of multiple correlation analysis to know whether the correlation between and variables collectively is positive and strong relation (Table 4).
From Table 4, it can be seen that the zero hypothesis to know the three variables is rejected, meaning that the relation between independent variables of and also collectively is linear and strong relation. Further, to know whether the regression coefficient between the three variables is significant, regression significant test is conducted through test (variance analysis) (Table 5).
The analysis result of regression significance using variance analysis ( test) shows that the variables of interest at Physics, knowledge of Mathematics basic concept, and both collectively to the ability to solve Physics problems give bigger value of than at significant level of α 0.05, respectively, are: ( = 12.37 > = 3,91), ( = 10.90 > = 3,91), and ( = 11,10 > = 3,06). These results cause to be rejected meaning that the regression coefficient of student interest at Physics, knowledge of Mathematics basic concept (X2), and both (X1, X2) collectively to ability to solve Physics problems is significant and linear.
The significant relation between interest at Physics and ability to solve Physics problems shows that higher student interest at Physics makes higher ability to solve Physics problems. This may happen, because as said in  the interest is a constant tendency to conduct an activity. The interest is also defined as a feeling of like, eager, giving attention, without any forces, and interest at something. Someone having high interest tends to give big attention to that something. As well as in studying Physics, if the students have interest at the taught material, they will be motivated to give all attention to taught materials, and finally, it will give positive effects to the study results.
The significant relation is also showed by the variable of knowledge of Mathematics basic concept to the ability to solve Physics problems. As stated by  there is a strong relation between Physics and Mathematics, while  states that Physics and Mathematics have similarity that is knowledge aiming at forming student skills in decision making and problem solving. It is clear that knowledge of Mathematics basic concept is an absolute thing which has to be possessed by student in studying Physics, or, in other words, studying Physics without comprehending Mathematics is an impossible thing. This is because Mathematics reviewing simple number count concept to complex formulation, including figure, graphics, formula, equation, geometry, and many more. In learning Physics, almost all Physics concepts are related with Mathematics. Each Physics problem requires completion with mathematical approach. So, it can be said that knowing and mastering knowledge of Mathematics basic concept will be very beneficial for student in completing Physics problems.
According to  Mathematics provides symbols expressed in Physics to show relation structure between different factors. The same thing is also stated by  that the expressed symbols may enable students for deep comprehension and correcting student procedural knowledge to different but interrelated symbols required in problem solving in Physics process.
Collectively, the interest at Physics and knowledge of Mathematics basic concept both have positive and significant relation with ability to solve Physics problems. These two variables are intersupporting in increasing student ability in problem solving of Physics. If the student interest at Physics gives attention, support, and willingness for student to study Physics, the knowledge of Mathematics basic concept will spur the student to complete various Physics problems systematically. So, the research results give information that the interest at Physics as well as the knowledge of Mathematics basic concept gives positive effect to ability to solve Physics problems.
Based on the data and discussion analysis results, it can be concluded that(1)there is a positive and significant relation between interest at Physics and student’s ability to solve Physics problems;(2)there is a positive and significant relation between knowledge of Mathematics basic concept and student’s ability to solve Physics problems;(3)there is a positive and significant relation between both of interest and knowledge of Mathematics basic concept with student’s ability to solve Physics problems.
Conflict of Interests
The author declares that there is no conflict of interests regarding the publication of this paper.
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