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when a truck pulls a trailer, the trailer and truck accelerate forward even though the action and reaction forces are the same size but are in opposite directions. why don't these forces balance each other out

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  1. They action and reaction forces are applied to diffent bodies. In this case, one is applied to the truck and the other is applied to the ground.

    The two forcs DO cancel out when you are considering the complete Earth-truck system, together.

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  2. When a truck pulls a trailer, the trailer and the truck acclerate forward even though the action and reaction forces are the same size but are in opposite direction. Why don't these force balance each other

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  3. When a truck pulls a trailer, the trailer and truck accelerate forward even though the action and reaction forces are the same size but are in the opposite directions. Why dont these forces balance each other?

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