conservation of momentumn

• What is the equation used to calculate momentum?

  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 is equal to the total momentum after the event
• How do you calculate the total momentum before a collision?

  • Calculate momentum of each object: momentum = mass × velocity
  • Sum the momentum of all objects involved
• If a van with a mass of 2,000 kg is traveling at 30 m/s, what is its momentum?

  The momentum is $60,000 \text{ kg m/s}$
• What is the momentum of a stationary car?

  The momentum of a stationary car is zero
• What is the total momentum of both the van and the car before the collision if the van's momentum is $60,000 \text{ kg m/s}$ and the car's momentum is zero?


  The total momentum is $60,000 \text{ kg m/s}$
• How do you calculate the velocity of two objects moving together after a collision?

  Velocity equals momentum divided by total mass
• If the total momentum after a collision is $60,000 \text{ kg m/s}$ and the total mass is $2,800 \text{ kg}$, what is the velocity of the van and car together?


  The velocity is $21.4 \text{ m/s}$
• What steps should you follow to solve a momentum problem involving a collision?

  1. Identify masses and velocities of all objects
  2. Calculate initial momentum for each object
  3. Sum initial momentum for total momentum before collision
  4. Use conservation of momentum to find total momentum after collision
  5. Calculate the final velocity using total momentum and combined mass
• If a van with a mass of 1,400 kg is traveling at 20 m/s, what is its momentum before colliding with a stationary car of mass 1,000 kg?

  The momentum is $28,000 \text{ kg m/s}$
• What is the total momentum of both the van and the car before the collision if the van's momentum is $28,000 \text{ kg m/s}$ and the car's momentum is zero?


  The total momentum is $28,000 \text{ kg m/s}$
• If the total momentum after a collision is $28,000 \text{ kg m/s}$ and the combined mass is $2,400 \text{ kg}$, what is the velocity of the van and car together?


  The velocity is $11.67 \text{ m/s}$
• Where can students find more questions on calculations involving momentum?

  In the revision workbook linked in the video