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Science Presentation.

My science presentation of gravity and motion.
by

Matthew McMahon

on 1 June 2011

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Transcript of Science Presentation.

Gravity and Motion. Hand Out Answer Sheet. How Gravity was Realized https://docs.google.com/document/d/1cID6vSAzoIPtBVee2Bu9z58j1zOQHT9CjTL2VIuuot4/edit?hl=en_US# Isaac Newton realized gravity after he saw an apple fall from a tree though it did not hit his head though most people think it did. Seeing the apple fall from the tree he began to think about what pulls things to the ground. So when we are thankful he discovered gravity we are just thankful for him seeing an apple fall. Force A force is a push or pull. Most everyday forces require the objects to be touching each other, but Newton realized that the force that holds the planets, moons, and other space objects does it over along distance without contact. He called this force "Gravity" Gravity Newton believed that the same force that pulled an apple from a tree pulled the planets towards each other. Gravity attracts all objects to each other. Most people think Newton discovered gravity but he didn't, he realized it. Scientists in Newton's day thought the forces on earth were different from the rest of the universe, but Newton was the first to realize it was the same as the rest of the universe. Law Of Universal Gravitation This law states that all objects in the universe attracts each other. The force of Gravity is measured in units called Newtons. The strength of the gravitational force between two objects depends on the masses of the two objects and their distance from each other. Mass Mass is the the amount of matter in an object. The Earth has such a large gravitational pull because it has a very large mass. The moon has a smaller gravitational pull which is why you weigh less. Weight Gravity attracts all objects toward each other The amount of gravity on an object is called weight. Unlike mass weigh can change depending on it's location. On then moon you weigh about one-sixth of what you weigh on Earth because it has less mass and thus less gravity. Inertia M You feel inertia everyday you live. for example when you are driving a car and you suddenly stop that's inertia pulling you forward even though the car stopped. The more mass an object the stronger the effects of inertia. "An object in motion stays in motion until acted apon by an equal and opposite force." M If mass increases, froce will increase too If distance increases, force will decrease The moon is attracted to the Earth because of gravity and the Earth is attracted to the sun because of gravity. Earth, our planet, is also held together because of gravity Attraction Newtons first law of motion. Newtons first law states that an object at rest will stay at rest and an object in motion will stay in motion until acted apon by an outside force.
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