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Newton’s Second Law of Motion Chapter 6

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Newton’s Second Law of Motion The net force acting on an object causes that object to accelerate in the direction of the net force. The net force acting on an object causes that object to accelerate in the direction of the net force. Greater the force = Greater acceleration. Greater the force = Greater acceleration. F F

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Inverse relationship between mass and acceleration!!! Inverse relationship between mass and acceleration!!! The greater the mass, the more force it takes to accelerate an object at the same rate of a less massive object!!! The greater the mass, the more force it takes to accelerate an object at the same rate of a less massive object!!! Newton’s Second Law of Motion F F

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The relationship between force, mass, and acceleration is expressed as: The relationship between force, mass, and acceleration is expressed as: F = ma SI unit = kg x m/s² = N Newton’s Second Law of Motion

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What is the force of a baseball weighing 0.06 kg that is accelerating towards a wall at 5,500 m/s²? What is the force of a baseball weighing 0.06 kg that is accelerating towards a wall at 5,500 m/s²? Sample Problem m = 0.06 kg a =5,500 m/s² F = ma= (0.06 kg x 5,500 m/s²) =330 N

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Newton’s Third Law of Motion Forces always exist in pairs (action- reaction pair). “Whenever two objects interact, the force exerted on one object is equal in strength and opposite in direction to the force exerted on the other object.” Single isolated forces cannot exist!

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Force of the satellite on the astronaut Force of the astronaut on the satellite The most important thing to keep in mind about action-reaction pairs is that each force acts on a different object.

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Example 2: How does a nail get driven into a piece of wood by a hammer? Force of the hammer on the nail Force of the nail on the hammer Force of wood on nail

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Assignment Pg. 138 #1, 2, 3 & 5 Pg. 138 #1, 2, 3 & 5 Pg. 140 # 1, 2, & 4 Pg. 140 # 1, 2, & 4

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