Need help calculating the minimum magnitude force to start the crate moving A 12-kg crate rests on a horizontal surface and a boy pushes on it with a force that is 30° below the horizontal. If the coefficient of static friction is 0.40, the minimum magnitude force he needs to start the crate moving is: 0 F sin 0 fk 0 F cos 0 F N mg

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Newton’s Third Law of Motion

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?”