# Freebody - Physics 201 Lecture 6 Dynamics More on Forces...

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3/27/08 Physics 201, UW-Madison 1 Physics 201: Physics 201: Lecture Lecture 6 Dynamics Dynamics More on Forces More on Forces Free Body Diagrams Free Body Diagrams

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3/27/08 Physics 201, UW-Madison 2 Dynamics Dynamics 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 The Normal Force The Normal Force When person is holding the bag above the table he must supply a force. When the bag is placed on the table, the table supplies the force that holds the bag on it That force is perpendicular or normal to the surface of table

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Physics 201, UW-Madison 4 Newton Newton s Third Law s Third Law For every action , there is an equal and opposite reaction . • Finger pushes on box F finger box = force exerted on box by finger F finger box F box finger • Box pushes on finger
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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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Freebody - Physics 201 Lecture 6 Dynamics More on Forces...

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