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 2 steel balls, a glass ball, a hollow wooden ball, and a plumb line. Shipping weight: 2 Lbs., dimensions: 20″ x 13″ x 10″.