Description: Gravity vehicles are characterized by periodically changing the center of gravity to achieve driving by their own gravity, the technical problems to be solved are how to change the center of gravity smaller and how to move the farther distance under the same force For primary and secondary school students handmade crafts and a small invention of a good creative model For children kids hand eye cooperation, intelligence development, hands and brain ability, learning more about science technology and mechanics. Also students educational toys and birthday/Chrismas gifts Color: multi-color Material: plastic and wood Specification: Experiment Purpose: 1. Make use of the principle of heavy objects falling to bring the wheels to move building a small car 2. Make students know the law of conservation of energy Experimental Report: Heavy objects falling pull the wheel to rotate, the top of the shelf is a fixed pulley, it can change the direction of the force. Due to gravity, the heavy objects generated the downward force, make use of ropes and fixed pulleys to change the direction of the force to turn the other end upward movement, pull the rope wrapped around the shaft so that the wheels rotate to achieve the purpose of driving Installation Steps: 1. Connect the bridge plate to the car frame 2. Installed car body, tied with a rope on the roller shaft, and then install the roller shaft to the car body, fitted with rear wheels 3. Put iron shaft into the car body, installed the wheels, hanging gravity pendant on the barb 4. Assemble the pulley and the pulley bracket with screws, fixing the support shaft 5. Pole inserted into the floor, put the support shaft into the pole, with a rope hanging pulley, the other end tied the gravity pendant Accessories: 1. Car Frame 2. Bridge Plate 3. Baseboard 4. Support Shaft 5. Tire 6. Iron Shaft 7. Rope 8. Screws 9. Camshaft 10. Pulley Support Shaft 11. Pole 12. Barb 13. Pulley 14. Gravity Pendant Size Chart: 18x11x35cm/7.09x4.33x13.78inch Package Includes: 1 Set DIY Gravity Car Toys Note: Chocking Hazard - Small parts. Not for children under 3 years