Forces summary

Forces summary - Applying Newtons laws & Friction Demo:...

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Applying Newton’s laws Friction
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Demo: Adding forces
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A systematic view Newton’s 3 rd law: Force pairs F CA = - F AC F = - F F CA = - F AC A B C F CA F AC F F F CB F BC
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A systematic view Newton’s 1 st nd law: Net Force F net = F + F CA a = F net / m A F F CA F net m a
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Adding forces A F F 2 F net m a Pulling on a rock
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Adding forces Pulling sideways on a rope Rope moves until net force is zero F 1 F 2 F 1 F 2
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Tactics: Drawing Free Body Diagrams ( FBD ) (for problems with Forces ) Draw the body ( one FBD per body involved) Draw it LARGE – no, LARGER Add ONLY forces acting on that body (NO forces acting on other bodies) Include a (smart) coordinate system Indicate your net Force (=sum of all other forces)
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An airplane heads E. The forces acting on it are: Gravity 16kN down Lift 16kN up Thrust 1.8 kN E Drag 0.8 kN W F tot = ? F tot = 1.0 kN E
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A ball, hanging from the ceiling by a string, is pulled back and released. Identify the forces acting on it just after its release. Example Problem
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FBD Which diagram corresponds to an airplane in constant velocity cruise flight? A) 43 B) 44 C) 45 D) 46
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An object is in equilibrium if the net force on it is zero . The net force is just the vector sum of all of
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This note was uploaded on 10/04/2011 for the course PHYSICS 101 taught by Professor Staff during the Fall '11 term at Syracuse.

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Forces summary - Applying Newtons laws & Friction Demo:...

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