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S2.4 Classification of forces

[A] Fundamental forces

Example

Example

The gravitational force law

  • attractive
  • magnitude:
    \[ F_{G} = \frac{Gm_1m_2}{r^2} \]
Graphic - No title - gravforcezero
 

[B] Phenomenological forces

Examples

Examples

— frictional force between two surfaces
Graphic - No title - frictionzero
— normal contact force between two surfaces
Graphic - No title - normalzero
— elastic force in compressed/ stretched medium
Graphic - No title - elasticzero
 

[C] Fictitious forces

Learning Resources

Textbook: HRW Chapter 5.7, 6.5