Forces between objects

• Resultant Force

  The single force that has the same effect as all the original forces acting together
• Equilibrium

  When the resultant force on an object is zero, so the object remains at rest or continues to move with constant velocity
• Newton's Third Law of Motion


  • For every action, there is an equal and opposite reaction
• Frictional Force

  The force resisting the relative motion of solid surfaces, fluid layers, or material elements sliding against each other
• Contact Force

  A force that acts when 2 or more objects touch each other