Science Conservation Of Momentum

• An external force is required to change the momentum of an object
• There will be no change in momentum if there is no external force
• The momentum of billiard balls is conserved when they collide with another ball
• Momentum


  The product of mass and velocity
• In a closed and isolated system, the total momentum of the objects before and after collision are equal
• Newton's third law states that for every action, there is an equal and opposite reaction
• When two objects interact, they exert equal forces on each other
• Momentum is a vector quantity, it has magnitude and direction
• Momentum transfer in a collision

  1. Cue ball travels toward the other ball, carrying some of the momentum with it

  2. The rest of the momentum is transferred to the second ball

  3. No momentum is lost, only transferred
• Mass


  The amount of matter an object contains
• Weight


  The force gravity applies to an object
• Calculating mass from weight

  Mass = Weight / Acceleration due to gravity
• The mass of the boy is 75 kg, and the mass of the girl is 50 kg
• Elastic collision


  Total kinetic energy of the system does not change, objects bounce off after collision
• Inelastic collision


  Total kinetic energy of the system changes, objects stick together after collision