an upward force equal to the weight of the wood. a downward force equal to the weight of the wood. an upward force equal to the weight of the displacement water. a downward force equal to the weight of the displacement water.
I gave my students this multiple choice question: A piece of pine wood floats on the surface of a lake because the water exerts

Only one answer is correct among these 4 choices:
- an upward force equal to the weight of the wood.
- a downward force equal to the weight of the wood.
- an upward force equal to the weight of the displacement water.
- a downward force equal to the weight of the displacement water.

Could you tell me which one is correct?

an upward force equal to the weight of the displacement water.