Perform experiments that illustrate elastic and inelastic collisions, conservation of momentum, and Newton's laws of motion. This set of two carts is constructed with solid stained wood bodies, plastic tops, and sturdy end plates. Low friction, ball-bearing wheels ensure smooth, straight tracking operation. Each cart is 30.5 cm long and 9 cm wide. The top surface is 271 cm2 which gives you plenty of room for loading additional masses. Includes two carts and ten rubber towing bands.