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Gravity car course presentation

   The characteristic of a gravity car is that it moves by relying on its own gravity through periodic changes，The technical problems to be solved are how to make the changing force smaller and how to move a longer distance under the same force。

Experimental purpose：1. A trolley is built based on the principle that the falling of heavy objects drives the rotation of wheels  

              2.Let students have a simple understanding of the law of conservation of energy

Experimental Report：

         The falling heavy object pulls the wheel to rotate，那么架子上端的是什么?？It is called a fixed pulley，So, what's its function            ?？ It can change the direction of the force，Let's imagine, students，Heavy objects move downward due to the influence of gravity, resulting in a downward movement            Kinetic energy，The direction of the force was changed by using a rope and a fixed pulley, making the other end move upward，The rope is wound around the pull shaft          The rope makes the wheel turn，The purpose of driving。

         那么是什么让小车行驶的更快更远?？

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