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Question

# Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?A. Rahul’s weight B. the chair’s weight C. the sum of the weights of Rahul and the book D. the sum of the weights of the chair, Rahul, and the book.

Solution

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The Earth's surface, just like everything in nature, obeys Newton's third law, which states that every action will yield an equal or opposite reaction, or in our case, every force will be met with equal counterforce.

The task correctly states that it is weight, our task is to determine which weight. While B. might sound appealing because the chair is one in direct contact with the surface, let's not forget that Rahul and the book both contribute their weight to the chair, and as a result, the Earth will respond with the force equal to the sum of Rahul, chair, and the book.

Consequently, the correct answer is D.

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