This study aims to develop an educational web application ‘WebGSIM’ for the topic of Gravitation and evaluate its usability among form 4 physics students in Jelutong District. This is a developmental research design study and WebGSIM was developed based on ADDIE instructional design model. ADDIE model has five phases which are analysis, design, development, implementation, and evaluation. After development, WebGSIM was validated by two experts. The research sample consisted of 67 form 4 physics students that was selected through cluster random sampling from all the students in Jelutong district. This research used a usability questionnaire of 20 items that was adapted from Technology Acceptance Model (TAM) to evaluate the usability of WebGSIM. The data was analysed using descriptive statistics of mean and standard deviation. The data from two experts showed that the newly developed WebGSIM had a good validity with 100% of agreement. The mean for the constructs of perceived ease of .....

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