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Published byFay Lynch Modified over 9 years ago
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Newton’s Laws of Motion
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Galileo’s Inertia After watching Jupiter’s Moons Galileo became convinced that objects had a tendency to keep whatever state of motion they had. He called this the objects’ inertia He confirmed it by doing experiments using balls rolling up and down ramps.
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Changes in Motion There are two ways that an object can change its motion: 1. It can change its speed. Speed up, slow down, stop or start 2. It can change direction A change in motion is called an acceleration. Notice that an object orbiting in a circle or ellipse is changing direction and therefore accelerating.
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The First Law` Isaac Newton developed the idea of inertia into his First Law of Motion “An object in motion stays in motion in a straight line, one at rest stays at rest, unless a force acts on it.”
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The Second Law The Second Law states that to change an object’s motion you must push or pull on it with a force. The amount force (F) is directly related to… the inertia of the object (mass, m) and how much change of motion (acceleration, a) you want to make. F = m a Remember: an acceleration can be a change in the object’s speed or in its… Direction.
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The Third Law “For Every action there is an equal and opposite reaction” Is Newton’s Third Law of motion…simplified. It means that if Object “A” exerts a force on object “B” then “B” must push right back on “A” with the same amount of force in the opposite direction!
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