NewtonsLaws - Physics 201 UW-Madison 1 Physics 201 Physics...

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Unformatted text preview: 3/27/08 Physics 201, UW-Madison 1 Physics 201: Physics 201: Lecture Lecture 5 5 Today’s lecture will be on Newton’s Laws of Motion 3/27/08 Physics 201, UW-Madison 2 Newton Newton ’s Laws s Laws Isaac Newton (1643 - 1727) published Principia Mathematica in 1687. In this work, he proposed three “laws” of motion: Law 1 : An object subject to no net external force is at rest or moves with a constant velocity, ( if viewed from an inertial reference frame). ! F net = ! F i i ! = ma Law 2 : For any object, ! F a , b = ! ! F b , a Law 3 : Forces occur in pairs: (For every action there is an equal and opposite reaction.) 3/27/08 Physics 201, UW-Madison 3 Newton Newton ’ ’ s First Law s First Law The motion of an object does not change unless it is acted upon by a net force . • If v =0 , it remains 0 • If v is some value, it stays at that value Another way to say the same thing: • No net force ⇔ • velocity is constant • acceleration is zero 3/27/08 Physics 201, UW-Madison 4 Contact and Field Forces Contact and Field Forces 3/27/08 Physics 201, UW-Madison 5 The Four Forces The Four Forces Types Strong nuclear force Electromagnetic force Weak nuclear force Gravity Characteristics All field forces Listed in order of decreasing strength Only gravity and electromagnetic forces are relevant in classical mechanics, which deals with motion of macroscopic objects. 3/27/08 Physics 201, UW-Madison 6 Question Question 1 1 An airplane flying: Many forces act on the plane, including weight (gravity), drag (air resistance), the thrust of the engine, and the lift of the wings. At some point during its trip the velocity of the plane is measured to be constant (which means its altitude is also constant). At this time, the constant)....
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This note was uploaded on 03/27/2008 for the course PHYS 201 taught by Professor Walker during the Spring '08 term at University of Wisconsin.

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NewtonsLaws - Physics 201 UW-Madison 1 Physics 201 Physics...

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