PhysicsClassical Physics

What Is Newton's 3rd Law? Forces on a Hand-Held Coffee Cup

Identify the forces on a supported coffee cup and place each third-law partner on the other interacting object.

Question

Suppose that you are holding a cup of coffee in your hand. Identify all forces on the cup and the reaction to each force.

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Evidence boundary

This answers Chapter 5 Conceptual Question 12. No masses or force magnitudes are supplied, so the answer identifies interactions symbolically. The container and cup-plus-coffee interpretations are stated explicitly. It uses the standard stationary, supported-cup model and neglects small atmospheric effects; the hand contact is a resultant, not an assumed grip geometry.