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Applications of Newton's Laws

by: Daria

Applications of Newton's Laws 2070

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

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About this Document

These notes cover applications of Newton's Laws including examples with free body diagrams
General Physics 1
Amy Pope
Class Notes
Physics, General Physics, newton's laws, free body diagrams
25 ?




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This 2 page Class Notes was uploaded by Daria on Tuesday September 20, 2016. The Class Notes belongs to 2070 at Clemson University taught by Amy Pope in Fall 2016. Since its upload, it has received 6 views. For similar materials see General Physics 1 in Physics at Clemson University.

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Date Created: 09/20/16
  Frictional  Forces  ● Kinetic   friction:   the friction experienced   by surfaces   sliding against  one   another  ○ The   kinetic frictional  force  depends  on  the  normal  force  ■ f        μ  N  k k ○ The   constant    μ k is called   he  coefficient    f   ineti  riction.  ○ Values   of   μk usually  vary    etween   0.1    nd      epending   on  the materials   that   re  interacting.  ● Static   Friction:   the static  frictional force  keeps   an  object  from   starting  to move   after the  force   isadded    o the    ystem.   ○ The   static frictional force  has   a limit, maximum   value,  but  can  be  any  value   from  0  to the  maximum   depending   on  what   isneeded   to keep   the  system’s   sums   at zero.                      Strings     nd   prings  ● Tension  ● An   ideal  pulley  isone   that simply   changes   the direction   of the  tension:  there   isno  mechanical    dvantage.  ● In  real life the  tension   will vary  due  to weight  of  the rope   or string.    Applying     ewton’s   Laws  ● Strategy      ○ Diagram   and  given   variables   converted   to standard   units  ○ Draw   a free  body   diagram,  identify  the  positive  direction,  and   acceleration   is in the  positive  direction   for each   object  for a single   axis  ○ Resolve   forces  into  x and  y  components   (using  trigonometry)  ○ Include   allforces  ● An   object  is in equilibrium   when   the  net forces   acting  on  i equal   to zero.  This  will occur  when   velocity  i    ero   r   onstant.    Example  ● A  box,  with  a  mass   of 22kg,   is pulled  at a  constant   velocity  with  a rope   that makes  an  0 angle     f  5      ith  he   loor    the    ame   friction (μ=   0.4).   hat   is  he tension     fthe   ope?    ● A 100kg   box   with  a weight   of 980N   hangs   on  a rope.   Find  the  tension   when   the  box  is  stationary   and   at 5m/s   upward.      ● A sled  with   a mass   of 20kg   slides  along   a frictionless  ice  at 4.5m/s.   It crosses  onto   a rough  patch  of  snow  with  friction  with  force  of 12N.   How   long  does   itslide  before   coming   to rest?   


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