Forces

• A vector quantity has both magnitude (size) and direction, while a scalar quantity only has magnitude.
• what are the 2 types of forces?

  non contact- gravitational, electrostatic and magnet

  contact- tension, friction and normal contact
• spring constant


  the measure on how much force it takes to stretch or compress an object
• extension


  increase in length of string when stretched
• thinking distance


  distance travelled while the brain finds the need to stop
• breaking distance


  distance travelled with breaks applied
• reaction time


  length of time taken to respond
• stopping distance


  thinking distance + stopping distance
• moment


  turning effect of a force
• force


  push or pull acting on an object
• the higher the spring constant the more force is required
• is power a scalar quantity or vector?

  scalar quantity as it doesn't have direction
• W = MG
• P = MV
• Ee = 1/2 KE2
• F = KE
• M = FD
• vector quantities= displacement, velocity and force
• scalar quantities = distance, speed and weight
• f = mv/t
• what effects thinking distance?

  • alcohol/drugs
  • age
  • eyesight
  • distractions
  • tiredness
• what effects breaking distance?

  • tyre conditions
  • road
  • brake conditions
  • mass of car
  • weather
• centre mass


  the point at which its mass or weight can be thought as being concrentrated
• what is hookes law?

  force is directly proportional to the extension
• resultant force


  the sum of all forces acting on an object
• what is newtons first law?

  An object is at a constant velocity unless a resultant force is acting on it
• what is newtons second law?

  F = MA
• what is newtons 3rd law?

  every action has an equal and opposite reaction
• S = VT