When the truck is accelerating to the left, what is the direction of the friction force on box 1 (right, left, or none)?   Tries 0/3   What is the maximum magnitude of the static friction force holding box 1 in place?  N   Tries 0/3   What is the maximum magnitude of acceleration the truck can have such that box 1 does not slip?

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”