Halls Car, Student Plastic

Study the relationship between work and energy with this virtually frictionless plastic-wheeled car. Plastic-molded body has a deep central well for weights and covered wheels that snap back into place if dropped. High-tech partially recessed sleeve bearings never need adjustment. Instructions. Hole at one end for attaching strings. 13 x 5 x 3.5 cm. You need inclined plane, pulley and weights.