Chapter_4-5 - Ch 4 Newton's Laws of Motion Focus Problem...

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Ch 4: Newton’s Laws of Motion Focus: Problem solving with force diagrams Newton’s Laws: 1) If no force: v = constant ) 0 or 0 ( M F a = 2) Acceleration proportional to force and inversely with mass: 3) Two objects exert forces on each other of equal magnitude and opposite direction: F 12 = - F 21 Forces are vectors! (A push or a pull) Unit: Newton (N) is the force needed to accelerate a 1 kG mass at 1m/sec 2 = i i F a M = Total force acting on mass M Memorize this!
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Ch 4: Newton’s Laws of Motion y j - g ˆ g = 2 sec / m 80 9 . g = Weight: force of gravity: g W M = i.e ., force needed to cause acceleration g Gravitational Acceleration: g (down) (near earth surface) Normal Force N : acts at surface Weight and Normal forces: Acceleration of freely falling object (neglecting air friction): g W a M M = = g a = All objects fall with same accel.! M M N -N
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Ch 4: Newton’s Laws of Motion Force Diagrams: M N M Forces acting on M? W
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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.

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Chapter_4-5 - Ch 4 Newton's Laws of Motion Focus Problem...

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