The rope is pulling partly upward at an angle of 30 degrees to the horizontal. In this circumstance A. The normal force between the box and the floor is greater than the weight of the box. B. The normal force between the box and the floor is less than the force of gravity on the box.

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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?”