This apparatus allows students to investigate conservation of momentum and kinetic energy change in collisions. It can also be used to compare elastic and inelastic collisions. A flat base supports a curved aluminum track and an adjustable target support. The kit includes two steel balls, a glass ball, a hollow wooden ball, and a plumb line. The built in table clamp can accomodate tables edges up to 3.5 cm thick. Includes activity guide. Shipping weight: 2 Lbs., Dimensions: 20" x 13" x 10".