P2.3 NEWTONS LAWS

• what is newtons first law?

  objects will remain at rest, or move with a constant velocity unless acted on by a resultant force
• what happens if the resultant force acting on an object is zero?

  the object remains stationary OR the object will continue to move at the same velocity if it was moving
• what is newtons second law?

  the acceleration of an object is proportional to the resultant force acting on it and inversely proportional to the object's mass
• the greater the object mass, the _______ the acceleration

  smaller
• the bigger the resultant force, the _______ the acceleration

  larger
• what is newtons 3rd law?

  whenever 2 objects interact, the forces they exert on each other are equal and opposite
• what is intertia?

  Resistance to change in motion.
• • Larger inertial masses will experience small accelerations
  • Smaller inertial masses will experience large accelerations
• • Since velocity is a vector this means that the momentum of an object also depends on its direction of travel
  • This means that momentum can be either positive or negative
• • Therefore, the momentum of an object will change if:
  • The object accelerates (speeds up) or decelerates(slows down)
  • Changes direction
  • Its mass changes
• what type of collision is if they move in the same direction together?

  inelastic
• what type of collision is if they move in the opposite direction together?

  elastic
• • When the objects move in opposite directions:
  • Each object will have a different velocity depending on its mass and initial momentum of the system
• • When the objects move in the same direction together:
  • They will have a combined mass and velocity
• • The principle of conservation of momentum states that:

  In a closed system, the total momentum before an event is equal to the total momentum after the event