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Welcome to Physical Science
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Inertia The Tendency of things to resist changes in motion
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Newtons Laws First Law – Every material object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.
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Mass – measure of the quantity of matter 1 KG = 9.8 Newton's
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Newton's Laws Second Law – The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass A = F / M
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Force A Push or a Pull Gravitational, Electrical, Magnetic, Muscle effort A force is anything that accelerates an object
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When Acceleration is Zero State of mechanical equilibrium All forces acting on an object are canceled out Zero acceleration does not mean zero velocity
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Free Fall F = MA so A = F/M A more massive object will have a greater attraction to the earth but because of inertia will speed up slower A less massive object will have a smaller attraction to the earth but will speed up faster Both objects will hit the ground at the same time
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Free fall – terminal speed Pictures from: Physical Science – Hewitt, Suchocki, Hewitt
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Newtons Laws Third Law – Whenever an object exerts a force on a second object, the second object exerts and equal and opposite force on the first
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