Phys 0174 Fall 2008 - Chapter 05, 4 slides

# Phys 0174 Fall 2008 - Chapter 5 Force and Motion Begin the study of dynamics Newtons First Law Newtons Second Law Newtons Third Law 1 Newtons First

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1 Chapter 5 Force and Motion ¾ Begin the study of dynamics ¾ Newton’s First Law ¾ Newton’s Second Law ¾ Newton’s Third Law 2 Newton’s First Law The velocity of a body will not change unless it is acted upon by a force. If several forces act on a body (say , , and ) the net force is defined Note: as: AB C n e t FF F F GG G G net A B C =++ F FFF G GGG F a o m o Mass: Mass is an intrinsic characteristic of a body that relates a force F applied to the body to the resulting acceleration a . 3 4 If a spaceship in deep space turns off its engines, will it coast to a stop? b) Yes, it will slow down and stop just like a car does. a) No, it will coast forever.

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5 F net a m Newton’s Second Law The net force on a body is equal to the product of the mass of the body and its acceleration. In equation form Newton’s second law can be written as: net m = Fa G G 6 () 2 2 s m kg s m kg = SI Unit for Force This combination of units is called a newton (N). 2 ft pound slug s  =   7 F g
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## This note was uploaded on 10/18/2011 for the course PHYS 101 taught by Professor Cohen during the Spring '10 term at Pittsburg State Uiversity.

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Phys 0174 Fall 2008 - Chapter 5 Force and Motion Begin the study of dynamics Newtons First Law Newtons Second Law Newtons Third Law 1 Newtons First

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