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| ==(1) The principle of the ball forward==
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| [[File:A motor car (9).jpg|210px]]
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| A tennis ball is in a transparent acrylic ball. Due to the weight of the tennis ball, after being pushed, the movement of the tennis ball drives the movement of the acrylic ball.
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| [[File:A motor car (6).mp4]]
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| ==(2) Build the car==
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| [[File:A motor car (7).jpg|400px]]
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| <gallery>
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| File:A motor car (3).jpg|200px
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| File:A motor car (2).jpg|200px
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| File:A motor car (4).jpg|200px
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| File:A motor car (5).jpg|200px
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| File:A motor car (8).jpg|200px
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| </gallery>
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| ==(3)==
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| ===Put in the car without electricity===
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| [[File:A motor car (1).mp4]]
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| ===When the car is connected to power===
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| Since the weight of the car is not enough, need to push it from the outside to start the small ball. However, it cannot roll very far, and the car will tip over inside, making the ball completely unable to move. Still needs improvement.
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| [[File:A motor car (4).mp4]]
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