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**Newton’s Laws of Motion**

Chapter 4 Sections 1, 2, and 3 Glencoe: Pages

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Newton’s 1st Law An object at rest will remain at rest, and an object in motion will remain in motion unless acted on by an outside force Inertia – the tendency of an object to continue its current state of motion, at rest or motion Example: pulling a tablecloth out from under the table setting, or a car running into a wall

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Newton’s 1st Law If the car were to abruptly stop and the seat belts were not being worn, then the passengers in motion would continue in motion. The passengers would likely be propelled from the car and be hurled into the air becomes projectiles and continue in projectile-like motion.

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Newton’s 1st Law In this example, the ladder continues in motion because no outside force changes its original motion, until the ladder hits the ground.

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Newton’s 2nd Law The unbalanced force acting on an object equals the object’s mass times the object’s acceleration F = m•a SI units for force = Newton ***(1 N = 1 kg·m/s2)***

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Newton’s 2nd Law It is obviously takes less force to make the ball accelerate because the ball has less mass.

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Newton’s 2nd Law Example: Think of the force required to push an empty shopping cart, and the force required to push a full shopping cart. What is the difference? More force applied = greater acceleration

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**Newton’s 2nd Law Weight ≠ Mass**

Weight – the measure of gravity pulling on an object Mass – the measure of the amount of matter in an object

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**Newton’s 2nd Law Weight influences shape**

On land a supporting skeleton is required In water less body support required because the water helps lift the mass *Animals can be larger if they live in the water

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Newton’s 2nd Law Free fall – motion of a body when the only force acting on it is gravity Terminal velocity – maximum velocity reached when air resistance pushes up as much as gravity pulls down Force of gravity pulling down = force of air resistance pushing up

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Newton’s 3rd Law For every action there is an equal but opposite reaction ***Action and reaction forces are applied to different objects These forces occur in pairs at the same time, but do not cancel out! Example: rocketry

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Newton’s 3rd Law Actions and Reactions

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