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Gravity!!!!. Gravity. Gravity – the attraction of one mass toward another depends on the masses of each and their distance from one another from our perspective… gravity is a constant acceleration toward the center of the earth. Gravity.

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## Gravity!!!!

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**Gravity**• Gravity – the attraction of one mass toward another • depends on the masses of each andtheir distance fromone another • from our perspective…gravity is a constant acceleration toward the center of the earth**Gravity**• Gravity – the attraction of one mass toward another • decreases over distance • explains why the moon has more of a gravitational effect [tides, etc] on the earth than the sun**Gravity – continued**• Galileo Galilei • experimented to find out the acceleration of free-falling objects • showed that free-fall was constant • had difficulty showing this before using inclined planes • plane reduced force of gravity & increased distance, but with same result**Acceleration on Galileo’s Inclined Planes**Galileo found greater accelerations for steeper inclines. The ball attains max acceleration when the incline is tipped vertically.**Acceleration from Gravity**• Wait, wait! Why did some objects fall faster than others when we dropped them off the stadium????? • Air resistance – the friction of air particles on an object moving through it • accounts for varying speeds of falling objects**Air Resistance**• Without air resistance, all objects fall with the same constant acceleration due to gravity**Recap**• Galileo’s Observations: • a ball rolling down an inclined plane is moving with constant acceleration • greater accelerations for steeper planes, max acceleration when incline is tipped vertically • regardless of weight and size, when air resistance is small enough to be neglected, all objects fall with the same unchanging acceleration**Gravity**• g = acceleration due to gravity • g = 9.8 m/s2 on earth • g will change if • the object gets farther away from the center of the earth [distance change] • the object’s mass changes [but not in relation to the earth]

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