FORCES (2)

• 2 TYPES OF FORCE

  • Contact Forces
  • Non-Contact Forces
• Contact Forces


  Forces wherein an object needs a physical contact to another object
• Applied Force


  • The force exerted by someone or something towards another person or object
  • We use the letter 'F' as the symbol for applied force & depending on who or what applies the force, we write it smaller next to the letter 'F'
• Friction Force

  • The force that acts opposite or against another object
  • Slows down the movement of someone or something
  • Symbol of Friction force: Ff
  • The other force is written as f with the object applying force written smaller right next to it
• Normal Force


  • The force that acts perpendicular to an object
  • Supports an object as surface resists compression
  • We use 'F' of 'N' (Fn) as a symbol for the Normal force
• Tension Force


  • The force applied to a string, rope, chain, cable, & the like
  • A force countering the stretching force applied
  • Resists force that causes object to stretch
  • We use T as the symbol for tension force (Ft)
• Non-Contact Forces


  Forces where objects do not touch or aren't in contact w/ each other
• Gravitational Force


  • The force that attracts objects towards the Earth
  • The greater the mass, the greater the gravitational force that pulls it down
• Magnetic Force


  • The force that is exerted on what we call a field of attraction or repulsion
  • When using a magnet, attraction occurs only between opposite poles