This lecture explores the application of force plates in biomechanics, focusing on the measurement of ground reaction forces during activities like walking and jumping. It covers topics such as the estimation of the center of pressure, moments about a point, and inverse dynamics calculations for joint forces and moments. Additionally, it delves into posturography, discussing how body sway is controlled by the vestibular, visual, and proprioceptive systems. The lecture also includes examples of calculating jump height using force plate data and analyzing the relationship between the center of mass and center of pressure during standing postures.