PHYS_2014_Lecture_6

PHYS_2014_Lecture_6 - Lecture 6: Force and Motion Newtons...

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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 1 Lecture 6: Force and Motion Newton’s 1 st Law of Motion: A body in uniform motion remains in uniform motion, and a body at rest remains at rest, unless acted on by a nonzero net force. Newton’s 2 nd Law of Motion: F ma
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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 2 g F N F g F N F Normal Force The force that counteracts the force of gravity and prevents an object for falling through the table, surface of the Earth, etc., is the normal force , . N F
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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 3 Draw a diagram of the physical situation and label all the forces. Make sure you have clearing defined the “system” you are dealing with. 1000 kg g F T F The force of gravity acts on the 1000 kg mass in a downward direction. Tension in the chain acts on the 1000 kg mass in an upward direction. Free Body Diagrams
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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 4 Redefine the system to include the chain. While in the previous slide, we were only dealing with the 1000 kg mass, now we are dealing with the 1000 kg mass plus the mass of the chain. The force of gravity acts on the sum of the 1000 kg mass and the mass of the chain in a downward direction. A normal force acts in an upward direction on the sum of the 1000 kg mass and the mass of the chain. 1000 kg g F N F
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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 5 Free Body Diagrams can help us determine whether we are in an intertial frame for reference (constant , ) or a non-intertial frame of reference v 0 a 0 a inertial frame of reference Force of gravity is counteracted by normal force of the ground pushing up on the tires of the car. g F N F g F N F Car F non-inertial frame of reference In addition to the force of gravity and the normal force, we now have the force of the car’s engine accelerating the car in a forward direaction
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Fall 2010 Oklahoma State University PHYS2014: Benton Lecture 6, Slide 6 g F N F g F Lift F Mechanical Equilibrium: the sum of the forces is zero there is no change in the state of motion ( ). 0
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PHYS_2014_Lecture_6 - Lecture 6: Force and Motion Newtons...

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