Contact and Non Contact Forces

• vector quantity


  has both magnitude (size) and direction
• examples of vector quantities

  force,

  velocity

  displacement

  acceleration

  momentum
• Scalar quantities


  have magnitude only
• examples of scalar quantities


  Speed

  Distance

  Mass

  Temperature

  Time
• what can vector quantities be represented by?

  an arrow

  the length of arrow = magnitude

  direction of arrow = direction
• Force


  it is a push or pull on an object that is caused by it interacting with something
• what can forces either be?

  contact

  non contact
• contact forces


  when two objects have to be touching for a force to act is a contact force
• examples of contact forces

  friction

  air resistance

  tension

  normal contact force
• non contact forces


  if objects don't need to be touching for a force to act it is a non contact force
• examples of non contact forces

  Magnetic force

  Gravitational force

  Electrostatic force
• what happens when two forces interact?

  There is a force produced on both objects
• interaction pair


  a pair of forces that are equal in strength, but opposite in direction