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Isaac Newton

Isaac Newton. Newton’s First Law. "Every body perseveres in its state of being at rest or of moving uniformly straight forward except insofar as it is compelled to change its state by forces impressed ." (Principia).

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Isaac Newton

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  1. Isaac Newton

  2. Newton’s First Law • "Every body perseveres in its state of being at rest or of moving uniformly straight forward except insofar as it is compelled to change its state by forces impressed." (Principia) • An object in motion will remain in motion and an object at rest will remain at rest unless acted on by an outside force. • Inertia

  3. Newton’s First Demo

  4. Newton’s Second Law • "A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.” (Principia) • First Part: When I push something, the distance it moves depends on how hard I push it. • Second Part: If I push something, it moves in the direction that I pushed it.

  5. The Most Useful Equation • Newton’s Second Law: (Force = derivative of momentum)

  6. Newton’s Second Law Derived F = ma [F]=[m]*[a] [m]=kg [a]=m/s2 [F]=kg*m/s2=Newton

  7. Special Case: Gravity F = ma FGravity=mg g=9.8 m/s2≈10 m/s2

  8. Newton’s Third Law • "If one object exerts a force on another the other exerts the same force on the one" (Principia) • “For every action there is an equal and opposite reaction!” • ACTION = -REACTION

  9. Newton’s Third Law: Falling FEarth on Bubar= FEB FBubar on Earth= FBE

  10. Newton’s Third Law: Falling Earth on Bubar Bubar on Earth FEB=Fgravity FEB=mBubar*a FEB=mBubar*g FEB=70 kg*10 m/s2 FEB=700 Newtons FBE=FEB=700 N FBE=mE*aE aE=FBE/mE aE=700 N/6E24 kg aE~1E-22 m/s2 FEB = -FBE FEB FBE a Bubar= 10 m/s2 : a Earth=0.0000000000000000000001 m/s2

  11. Hero Engine Fac Fac Fwa Fwa Fwa Fwa Fac Fac

  12. RECALL • Newton’s First Law: Inertia • Newton’s Second Law: F=ma • Newton’s Third Law: Action=-Reaction

  13. Wolf 330

  14. Questions? • Lesson, demonstrations and additional resources located online at: http://bubarnewtonslaws.wikispaces.com/ • Your welcome to try demos after class !

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