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Sir Isaac Newton English physicist & mathematician …he developed the 3 laws of motion Motion is any change in position! p. 45 Click here

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Forces Forces Forces can have the ability to change motion!!! Forces can have the ability to change motion!!! a push or a pull a push or a pull Unit: Newton (N) p. 46

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Force Amount of matter (resists forces) p. 47 vs. Mass Mass

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Newton’s 1st Law (Law of Inertia) “An object in motion wants to stay in motion, an object at rest wants to stay at rest.” FYI- Inertia depends upon mass. Sir Isaac Newton’s 3 Laws of Motion: p. 48

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“Acceleration occurs in the direction of the force.” the object’s mass… and also the size of the force… determine the object’s acceleration Newton’s 2nd Law (Law of Acceleration) p. 49

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Formula: Formula: - Acceleration (m/s 2 ) Force (N) Mass (Kg) Ex.) p. 49, 50 Newton’s 2nd Law (calculating acceleration) p. 49 A =F/ m

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Types of Forces Forces cause motion Motion depends on net force p. 51 Forces can be balanced or unbalanced

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Balanced Forces Like a tie in an arm wrestling match! Equal in size Opposite in direction No motion occurs! (equilibrium ) p. 51

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Unbalanced Forces Opposite in direction 2nd law 2nd law: unbalanced forces cause acceleration Unequal in size p. 51

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Gravity pulls everything down with a force of 9.8 N (Newtons) Gravity p. 52 downward A force that pulls us downward toward the center of the Earth. Click here

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The gravitational force felt by an object is related to its mass. Mass does NOT change, but your weight will change with a change in gravity (moon)!

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mass x gravity (force) mass x gravity (force)Mass Amount of matter (resists forces) p. 53 vs. Weight Weight

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Formula: Formula: - FwFwFwFw = mg Weight force (N) Mass (Kg) Gravity (9.8 m/s 2 ) p. 53 Calculating Weight

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Friction opposes an object’s motion opposes an object’s motion 1. Air friction 2. Viscous friction 3. Sliding friction 4. Rolling friction p. 54 Four Types of Friction:

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Also called Air resistance (aerodynamics reduce the air friction ) 1. Air Friction Ex) falling objects or airplanes p. 54

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Moving through a liquid, or fluid 2. Viscous Friction Ex) swimming p. 54

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3. Sliding Friction Two surfaces rub against one another Ex) rubbing hands or clapping Caused by irregularities in the surface p. 54

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An object rolls over a surface 4. Rolling Friction Ex) ball bearings, roller skates, or wheels p. 54 Figure 3.9

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“For every action, there is an equal and opposite reaction.” “For every action, there is an equal and opposite reaction.” Newton’s 3rd Law (Action /Reaction) Newton’s 3rd Law (Action /Reaction) p. 57

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Formula: P = mv Momentum (Kg-m/s) Mass (Kg) Velocity (m/s) p. 58 Calculating Momentum

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Total amount of momentum can not change Law of Conservation of Momentum p. 58 ex.) p. 59

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