A Box Rests on a Frictionless Countertop

question 3

Multiple Choice

A box rests on a frictionless countertop. A boy pushes horizontally to the right on the box, and a girl pushes on it to the left, yet it remains stationary. Which of the following statements is false?

• A) We know the force of the boy on the box is equal in magnitude to the force of the girl on the box, because the box is in equilibrium.
• B) We know the force of the boy on the box is equal in magnitude to the force of the box on the boy, because of Newton's third law.
• C) We know the weight and normal force are equal in magnitude because the box is in equilibrium.
• D) We know the weight and normal force are equal in magnitude because of Newton's third law.

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