Conservation of momentum

• What should you be able to do by the end of the video on momentum calculations?


  Carry out momentum calculations involving events like collisions
• Who is the target audience for the momentum calculations video?


  Triple physics students
• How is momentum calculated?

  Momentum equals mass multiplied by velocity
• What does it mean for momentum to be conserved in a closed system?


  The total momentum before an event equals the total momentum after the event
• What is the process to calculate the velocity of two colliding objects after the collision?


  1. Calculate total momentum before the collision.
  2. Use the conservation of momentum to find total momentum after the collision.
  3. Divide the total momentum after the collision by the total mass of the objects.
• What is the mass of the van in the sample question provided?


  2,000 kilograms
• What is the velocity of the van in the sample question before the collision?


  30 meters per second
• What is the mass of the stationary car in the sample question?


  800 kilograms
• What is the momentum of the van before the collision?


  60,000 kilograms meter per second
• What is the momentum of the stationary car before the collision?


  Zero
• What is the total momentum of both the van and the car before the collision?


  60,000 kilograms meter per second
• What is the total mass of both the van and the car after the collision?


  2,800 kilograms
• What is the velocity of the van and the car together after the collision?


  21.4 meters per second
• What is the mass of the van in the second question provided?


  1,400 kilograms
• What is the velocity of the van in the second question before the collision?


  20 meters per second
• What is the mass of the stationary car in the second question?


  1,000 kilograms
• What is the momentum of the van before the collision in the second question?


  28,000 kilograms meter per second
• What is the total momentum of both the van and the car before the collision in the second question?


  28,000 kilograms meter per second
• What is the total momentum of both the van and the car after the collision in the second question?


  28,000 kilograms meter per second
• What is the combined mass of the van and the car in the second question?


  2,400 kilograms
• What is the velocity of the van and the car together after the collision in the second question?


  11.67 meters per second
• Where can students find more questions on momentum calculations?


  • In the revision workbook
  • Available via a link provided in the video
• Dynamic Equilibrium


  A state where the rates of forward and reverse reactions are equal, and concentrations of reactants and products remain constant.
• Le Châtelier's Principle


  A system at equilibrium will respond to a change by counteracting the change and re-establishing equilibrium.