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Across 4. Pushback from air when something moves. 5. The measurement for how heavy an object is. 6. Takes the shape of its container. 7. The tendency of an object to float in a fluid. 8. The force that pulls objects towards the Earth. 10. Total exposed area of an object. 11. Motion under gravity without other forces.

Down 1. The force that attracts two objects toward each other; it's stronger with more massive objects. 2. How much stuff is packed in a space? 3. The famous scientist who formulated the laws of motion and universal gravitation. 9. The amount of matter in an object; it doesn't change with location.