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there is a type of device on the train of the rollercoaster that is known as the "chain dog". the "chain dog" grabs the hill so it doesn't roll backwards, but it still allows the train to go upwards by the pulling motion of the chain (note: the bolded "chain" is not the chain dog, the chain dog holds while the regular chain pulls)

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15y ago
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13y ago

Gravity keeps you from sliding backwards when you climb a hill. If there is no gravity you will fall of the hill.

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Q: What keeps you from sliding backwards when you climb a hill?
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