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Name________________________Science Teacher___________Period_______Date_________ Gravity - pp. 326-329 in blue science book NEWTON center of Earth. 1. ___realized that a force acts to pull objects straight down toward the GRAVITY 2. ___is the force that pulls objects toward each other. FREE FALL 3. When the only force acting on a falling object is gravity, the object is said to be in ___ ___. 9.8 m/s2 4. The acceleration rate due to the force of gravity is ___ ___/___. PROJECTILE 5. An object that is thrown is called a ___. AIR RESISTANCE 6. What is the main reason all objects do not fall at the same rate on Earth? TERMINAL VELOCITY 7. The greatest velocity the object reaches as it falls is called ___ __. WEIGHT 8. ___ is a measure of the force of gravity on an object. MASS 9. ___ is a measure of the amount of matter in that object. LAW OF UNIVERSAL GRAVITATION 10. The ___ ___ ___ ___ states that the force of gravity acts between all objects in the universe. MASS 11. Your ___ will remain the same on another planet or moon. WEIGHT 12. Your ___ will be different due to different gravitational forces. 13. The gravitational force, or pull, depends on two things. a. The MASS of the two objects b. The DISTANCE between the two objects (Over) Friction – pp323-325 in blue science book UNBALANCED 1. A book’s motion only changes if an ___ force acts upon it. FRICTION 2. When a book slides, the force of ___ causes it to slow to a stop. GRAVITY downward. 3. When a book falls, the force of ___ causes it to accelerate IRREGULARITIES many ___. 4. Although surfaces may seem quite smooth, they actually have FRICTION 5. The force that one surface exerts on another when the two rub against each other is called ___. FRICTION / FOREVER 6. Without ___, the object would continue to move at a constant speed ___. 7. The strength of the force of friction depends on two factors: a. the TYPES of surfaces involved and b. how HARD the surfaces PUSH ROUGH together. 8. ___ surfaces produce greater friction than smooth surfaces. FORCEFULLY 9. If you rub your hands together ___, there is more friction than if you rub your hands together lightly. NO! 10. Is friction necessarily a bad thing? SLIDING FRICTION 11. When solid surfaces slide over each other, the kind of friction that occurs is called ___ ___. ROLLING FRICTION 12. When an object rolls over a surface, the kind of friction that occurs is ___ ___. FLUID FRICTION 13. The friction that occurs when an object moves through a liquid or a gas is called ___ ___. FLUID FRICTION 14. Of the 3 types of friction listed above (11, 12, 13), which one usually requires the least amount of force to overcome?