Grade 8 science

• Magnitude


  • Refers to how strong the force is
  • The greater the magnitude, the faster the velocity
• Newton (N)


  Unit of force in the MKS or the Meter-Kilogram-Second System
• Dyne (DYN)


  Unit of force in the CGS or the Centimeter-Gram-Second System
• Pound (LBS)


  Unit of force in the FPS or Foot-Pound-Second System
• Types of forces


  • Contact forces
  • Non-contact forces
• Contact forces


  Forces where an object needs physical contact to another object
• Contact forces


  • Applied force - force exerted by a person or an object on another person or object
• Friction


  The force that acts opposite or against another object
• Ff

  Symbol of friction force
• Normal


  The force that acts perpendicular to an object
• Fn


  Symbol of normal force
• Tension


  The force applied to a string, rope, chain, Cable and the like
• Ft


  Symbol for tension force