Natural Forces by K2Tytb9

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									         Free body diagrams
• Aids identifying forces
• One diagram per object
• Look only at forces acting upon object, not
  by object on others
• Identify direction and type of force
• Build 2nd law relationships from free body
  diagrams
                       Natural Forces
1.       Gravitational
     •      Acts on, and created by, mass
     •      Infinite in range
2.       Electromagnetic
     •      Acts on, and created by, electric charge
     •      Infinite in range
3.       Strong Nuclear
     •      Acts on, and created by, color charge
     •      Finite in range
4.       Weak Nuclear
     •      Acts on, and created by, hypercharge
     •      Finite in range
• Gravitation
  – Ignorable on the atomic scale, critical on large
    scales.
• Electromagnetism
  – Drives all chemical and biological interactions
• Strong & Weak Nuclear Forces
  – Responsible for radioactive decay, fission, and
    fusion.
            Macroscopic Forces
• Weight (mg or w)
   – mass x gravity
   – Acts towards center of Earth
• Normal (N)
   – Requires contact between objects
   – Acts perpendicular to contacting surface, towards object
• Tension (T)
   – Acts along rope, bar, etc (1-dimensional object)
• Friction (f)
   – Requires contact between objects
   – Acts opposite to (potential) change in motion
• Applied (F)
   – Explicitly specified

								
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