Newtons laws of motion

• Newton's First Law


  An object only changes velocity if a net force acts on it
• Newton's First Law


  1. An object at rest will remain at rest

  2. An object in motion will continue moving at the same velocity in a straight line
• There must be a resultant force acting on an object if it is doing any of the listed changes in velocity
• Momentum


  A property of all moving objects, a vector quantity that depends on mass and velocity
• Momentum equation


  Momentum (kg m/s) = mass (kg) x velocity (m/s)
• Don't confuse mass (m) and momentum (p)
• Speed has a bigger effect on braking distance than on thinking distance
• Reaction time


  The time between perceiving a stimulus and starting to respond, affected by factors like fatigue, distractions, etc.
• Brakes applied


  Frictional force applied to wheels, transferring kinetic energy to thermal energy in brakes
• The faster a vehicle moves or the greater its mass, the greater the kinetic energy, the more work needed to slow it down, the greater the braking force and distance needed