Momentum part 1

• What is momentum?

  A property of all moving objects
• How is momentum calculated?

  Mass multiplied by velocity
• What is the momentum of a 4,500 kg dinosaur moving at 12 m/s?

  $54,000 \text{ kg m/s}$
• What is the momentum of a 1,200 kg car traveling at 25 m/s?

  $30,000 \text{ kg m/s}$
• What type of quantity is momentum?

  A vector quantity
• If the forward direction is to the right, what is the momentum of the dinosaur?

  Positive momentum
• If the forward direction is to the right, what is the momentum of the car?

  Negative momentum
• What does the conservation of momentum principle state?

  Total momentum before equals total after
• How do you find the total momentum before a collision?

  Add the momentums of both objects
• What is the total momentum before the collision of the dinosaur and car?

  $24,000 \text{ kg m/s}$
• What does a positive total momentum indicate in this scenario?

  Movement to the right
• How do you find the shared velocity after the collision?

  Velocity equals momentum divided by mass
• What is the combined mass of the dinosaur and car?

  $5,700 \text{ kg}$
• What is the velocity of the combined particles after the collision?

  $4.4 \text{ m/s to the right}$
• What happens to momentum for stationary objects before an event?

  Total momentum is zero
• What is the initial momentum of a gun before it is fired?

  Zero momentum
• What happens to the gun's momentum when it fires a bullet?

  Gun recoils with equal momentum
• How do you calculate the bullet's momentum if it has a mass of 5 grams and velocity of 120 m/s?

  $0.6 \text{ kg m/s}$
• What is the equation for the gun's momentum?

  2 times velocity
• What must the total momentum of the gun and bullet equal?

  Zero momentum
• How do you find the gun's recoil velocity?

  Rearrange momentum equation
• What is the recoil velocity of the gun?

  $-0.3 \text{ m/s}$
• What does a negative recoil velocity indicate?

  Movement in the opposite direction
• What is the symbol for momentum?

  p
• How can the momentum equation be written?

  $p =$$mv$
• What are the key concepts of momentum discussed in the video?

  • Momentum is mass times velocity
  • Momentum is a vector quantity
  • Conservation of momentum principle
  • Total momentum before equals total after
  • Momentum can be zero for stationary objects
• What are the steps to calculate the recoil velocity of a gun after firing a bullet?

  1. Calculate bullet's momentum
  2. Set gun's momentum + bullet's momentum = 0
  3. Rearrange to find gun's velocity