Forces

• vector

  have magnitude and a direction
• physical quantities of vectors

  force, velocity, displacement, acceleration, momentum
• scalar


  speed, distance, mass, temperature, time
• scalar


  only has magnitude, no direction
• what is a force?


  a push or a pull on an object that is caused by it interacting with something
• examples of contact forces

  friction, air resistance, tension in ropes, normal contact force
• examples of non-contact forces

  magnetic force, gravitational force, electrostatic force