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Newton's Laws & Momentum

Terms & Definitions

  • force- a push or pull that acts on an object
  • net force- the overall force acting on an object after all forces are combined
  • friction- a force that opposes the motion of the objects that touch as they move past each other
  • static friction- the friction force that acts on objects that are not moving
  • sliding friction- a force that opposes the direction of motion of an object as it slides over a surface
  • rolling friction- the friction force that acts on rolling objects
  • fluid friction- opposes the motion of an object through a fluid
  • air resistance- fluid friction acting on an object moving through the air
  • gravity- a force that acts between any two masses
  • projectile motion- the motion of a falling object after it is given an initial forward velocity
  • inertia- the tendency of an object to resist a change in its motion
  • mass- a measure of the inertia of an object
  • weight- a measure of the force of gravity acting on an object
  • momentum- the product of an object's mass and it's velocity
  • law of conservation of momentum- if no net force acts on a system, then the total momentum of the system does not change
  • Newton's First Law of Motion- the state of motion of an object does not change as long as the net force acting on the object is zero
  • Newton's Second Law of Motion- the acceleration of an object is equal to the net force acting on it divided by the object's mass
  • Newton's Third Law of Motion- whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.