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Newton's Laws of Motion

by: Daria

Newton's Laws of Motion 2070

Marketplace > Clemson University > Physics > 2070 > Newton s Laws of Motion
GPA 4.0

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About this Document

This is all of Newton's Laws of Motion and physics applications
General Physics 1
Amy Pope
Class Notes
Physics, General Physics, Newton’s Laws, motion
25 ?




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This 2 page Class Notes was uploaded by Daria on Thursday September 15, 2016. The Class Notes belongs to 2070 at Clemson University taught by Amy Pope in Fall 2016. Since its upload, it has received 5 views. For similar materials see General Physics 1 in Physics at Clemson University.


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Date Created: 09/15/16
  Newton’s   Laws   of    Motion    Force   and  Mass  ● Forces     re a push   or pull  ● Forces   act on  an    bject  ● Forces   require    n agent   to supply    he  energy  ● Forces     re   ectors  ● Forces   can  be  contact   (short  times)  or long  range  force  (such   as  gravity)  ● The   direction  of a  force  is a vector,  so  when   an  object  is at rest, there   i equal   force  acting  on  objects   from  both  sides.  When   a force  becomes   greater   on  one  or more   sides  that are  not    qual, the  object  will move.  ● Mass   isa  measure   of how   hard  an  object’s  velocity  is to change.    Newton’s  First    aw     Motion  ● An   object  at rest remains   at rest, an  object   inmotion   continues  in motion  unless   acted  upon  by  an  external   force.  ● If you  stop  pushing   an object,  it wil keep   moving   unless   another   force  acts  on  it such  as  friction.  ● This  is also  known   as  the law  of inertia.  Inertia is resistance  an  object  has   to change   in  motion  ● An   inertial reference   frame   is one  in which  the  firstlaw  is true.  Inertial systems   occur  when  you   have  a  reference  frame  that  moves   with  constant   velocity.    Newton’s    econd     aw     Motion  ● The   acceleration   of an  object  is directly porportional   to the  resulting  force  and  inversely  proportional   to the  mass.   The   direction  of acceleration   is the same   direction  as  the  resulting.  Net force ○ a= mass      R     Σ F=ma  ● Two  equal   weights  exert  twice   the force  of one.  ● This  can   be  used  for calibration   of a spring.  ○ F=­kx  ● Free   body   diagrams   represent   the forces   of an  object.  ○ Identify all  orces  acting   on the  object  ■ Normal   force  ■ Weight   force  ■ Tension  ○ Draw  a  coordinate    ystem  ○ Represent   an object   as a  dot  at the  origin  of the coordinate   axes  ○ Draw  and   label the  resultant   acceleration  vector.  This  selects   the coordinate  direction.        Common  Forces   in Everyday   Life  ● Weight   ­ the gravitational  pull of  the earth   on a  n object  on  or  near  the  surface   of the  earth.  ○ Weight  (in kilograms)   is   ass  times     ravity.   ■ MASS   DOESN’T   CHANGE   NO   MATTER   WHERE   YOU   ARE.  ○ Weight  is a force     easured   in Newtons.  ● Tension   ­ an  equilibrium   force  that is usually   when   something   is being  hung  from   a string.  ● Spring  Force  ­ a  contact  force  that  is caused  by  a  stretch  or compression  ○ F=­kx  ● Drag  Force   i a  resistive  force  that resists  an  object’s  motion,   such   as gravity,  liquid, air  ● Thrust   Force   ­ When   an  object  pushed  molecules   such  as  air behind  itto  move   in the  opposite   direction.  ● Normal  force  ­ due   to atomic   structure   of solids, an  object   placed   on  a material   will  experience   normal  force.  ○ Equals   weight   when   object  is stationary   on  a flat surface.  ● Kinetic   Friction  ­occurs  when   an  object  slides  on  a surface.   This  kinetic  friction slows  down   the  motion   of an  object.  ● Static  Friction  ­ occurs   when   an  object  is stationary   on a  surface   and  this force  prevents  the  object  from   moving.  This  friction  points  in the opposite   direction  of the  anticipated  motion.    Newton’s  Third     aw     Motion  ● Every  force   occurs   as one   member   of an  action/reaction   pair of  forces.  ○ The   members   of the  action/reaction   pair act  on  different  objects.  ○ The   forces  are  equal  in magnitude  and   opposite   in direction  ● For   every  action,  there  is an  equal   and  opposite   reaction.    Apparent  Weight  ● Weight   changes  based   on  the acceleration   around   you.  ● If you  are  in freefall and   stand  on  a  scale,  your  apparent   weight   would   look  to be  zero. 


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