The purpose of this study was to examine students' learning of simple machines, a fifth-grade (ages 10-11) forces and motion unit, and student engagement using a teacher-created Multiplayer Educational Gaming Application. This mixed-method study collected pre-test/post-test results to determine student knowledge about simple machines. A survey ascertained the time spent using the computer for general purposes, and the time spent playing computer games as a function of gender. The pre-test and post-test design involved 74 students, 31 males and 43 females, who played the "Dr. Friction" Multiplayer Educational Gaming Application for several days in the middle of the unit. Results showed the females averaged using the computer more than their male counterparts and males played video games more than females. Analysis of covariance suggested no significant difference between the factor gender (p greater than 0.05) but statistically significant differences in gain scores (p = 0.001). Observations and qualitative focus groups suggested high student engagement and how video game technology can scaffold learning of simple machines. (Contains 3 figures and 4 tables.)