Momentum

• How is momentum calculated?

  Momentum (kg m/s) = mass (kg) x velocity (m/s)
• 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?

  It is a vector quantity
• If the forward direction is to the right, and a dinosaur is moving to the right, what is the momentum of the dinosaur?

  Positive momentum
• If the forward direction is to the right, and a car is moving to the left, what is the momentum of the car?

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

  In a closed system, the total momentum before an event is the same as the total momentum afterwards
• What does a positive total momentum indicate in this scenario?

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

  Velocity (m/s) = momentum (kg m/s) / mass (kg)
• What happens to momentum for stationary objects before an event?

  It is zero
• What must the total momentum after an event be if it started at zero?

  It must also be zero
• What happens to the gun's momentum when it fires a bullet?

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

  $0.6 \text{ kg m/s}$
• How do you express the gun's momentum if its mass is 2 kg and velocity is unknown?

  2v, where v is velocity
• What does a negative recoil velocity indicate?

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

  It is represented by p
• How can the momentum equation be expressed using its symbol?

  p = mv
• What are the key concepts of momentum?

  • Momentum is mass times velocity
  • Momentum is a vector quantity
  • Conservation of momentum principle
  • Momentum can be zero for stationary objects
• After 2 particles collide what happens to them?

  • they will both move in the direction of the particle with the most momentum
  • they will be treated as a single large particle