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Name: _____________________________ Physical Science, 7th & 8th grade Class: _____________________________ 2 points crossword (pages 311-328) 5 points flipcards Ch. 10 Forces; crossword Across *4. type of fluid friction that objects falling through air experience 7. equal forces acting on object in opposite directions *8. measure of the force of gravity on an object 9. when two forces act in the same direction you must _________ them together *11. the amount of matter in an object, the measure of the inertia of an object 12. type of friction when an object moves through a liquid *14. the greatest velocity an object can reach *16. Italian astronomer that questioned that force is needed to keep an object moving *17. any object that is thrown *18. English mathematician who discovered the three basic laws of motion *19. tendency of an object to resist change in its motion 20. type of friction when solid surfaces slide over each other 21. the overall force on an object after all the forces are added together Down 1. force is described by this, and also by how strong it is *2. when the only force acting on a falling object is gravity *3. a push or a pull exerted on an object 5. when two forces act in opposite directions, they combine by ___________ 6. a net force, nonzero force, that acts, or changes, an objects motion 10. type of friction when an object rolls over a surface *12. the force that one surface exerts on another when the two rub together 13. the sum of the net force when you add equal forces exerted in opposite directions *15. this equals force divided by mass Make “flip cards” for all the vocabulary marked with a (*).