This research aimed to describe the ability level of scientific work skills and find out an increase in the students’ ability of scientific work skills when using crocodile physics simulation media. The research method used was descriptive qualitative. The research subjects were 35 students of class X MIPA 2 of SMAN Jenggawah. Data collection tools used in the form of the results of the assessment of practicum worksheets 1 definition of momentum and practice worksheets 2 of the law of conservation of momentum. Based on the results of research conducted obtained; first, the ability of students’ scientific work skills when using crocodile physics simulation media shows that students are highly skilled in formulating problems, formulating hypotheses and communicating data. Students have skilled abilities in applying concepts, formulate variables and define operational variables. Whereas the indicators analyze the data and make conclusions having sufficient skilled enough. Second, there is an increase in the ability of students’ scientific work skills from practicum 1 to practicum 2 when using crocodile physics simulation media on all indicators. For indicators to formulate variables and analyze data based on trendline lines in microsoft excel in the form of slope lines or gradients between the two graphs there is a relatively small increase in ability.
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