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Forces summary

# Forces summary - Applying Newtons laws Friction Demo Adding...

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Applying Newton’s laws & Friction

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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 & 2 nd law: Net Force F net = F + F CA a = F net / m A F F CA F net m a
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)
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
FBD Which diagram corresponds to an airplane in constant velocity cruise flight? A) 43 B) 44 C) 45 D) 46

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Equilibrium An object is in equilibrium if the net force on it is zero .
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Forces summary - Applying Newtons laws Friction Demo Adding...

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