Conservation of momentum

• What is the formula to calculate momentum?

  Momentum = mass multiplied by velocity
• What happens to total momentum in a closed system during an event?

  Total momentum before equals total momentum after
• In a collision, if a van and a car move together, what is conserved?

  Momentum is conserved
• What is the total momentum of a 2000 kg van traveling at 30 m/s before colliding with a stationary 800 kg car?

  60,000 kg m/s
• What is the momentum of a stationary car?

  Zero
• How do you calculate the velocity of two objects moving together after a collision?

  Velocity = momentum divided by mass
• What is the total mass of a 2000 kg van and an 800 kg car after a collision?

  2800 kg
• What is the combined velocity of a 2000 kg van and an 800 kg car after they collide and move together?

  21.4 m/s
• What is the mass of the van in the second example?

  1400 kg
• What is the momentum of a 1400 kg van traveling at 20 m/s before colliding with a stationary car?

  28,000 kg m/s
• What is the total momentum of the van and car after the second collision?

  28,000 kg m/s
• What is the combined mass of a 1400 kg van and a 1000 kg car?

  2400 kg
• What is the velocity of the van and car together after the second collision?

  11.67 m/s
• What are the steps to calculate momentum in a collision?

  1. Identify the mass and velocity of each object.
  2. Calculate the momentum of each object.
  3. Sum the total momentum before the collision.
  4. Use conservation of momentum to find the combined velocity after the collision.
• What types of questions can be found in the revision workbook related to momentum?

  • Calculations involving momentum
  • Examples of collisions
  • Conservation of momentum scenarios