Physics

• Newton's Second Law

  • Linking inertia and force:
  • If an object has more mass the force applied is less effective in changing its motion
  • a = acceleration (m/s^2)
  • F = net force (N)
  • m = mass (kg)
• Newton's Second Law

  The overall (net) force acting in each direction (horizontally and vertically)

  Net force considers to what extent forces in each direction are unbalanced
• Newton's Third Law

  • "Every action has an equal but opposite reaction."
  • If you push on something it pushes back on you with the same amount of force
  • What evidence is there for this?
  • If the force was not equal and opposite then you would fall through the object
• Newton's first law of motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
• Acceleration = Force / Mass
• Force (N) = Acceleration (m/s^2) x Mass (kg)
• A vector quantity has both magnitude (size) and direction.
• Mass = Weight / Gravity
• Force


  A force causes an object to change its present state of motion or transfers energy to be stored or used for movement
• Gravity


  Exerts a force on all objects constantly
• Force due to gravity must be balanced on all objects that don't fall vertically
• The net force on this car is 6000N to the left
• Newton's First Law


  • "An object remains at rest or in constant motion unless acted on by a net external force."
  • An object won't change what it's doing if all of the forces are balanced
  • This law is often referred to as "the law of inertia"