Momentum (1/2)

• What is the main property that all moving objects have?

  Momentum
• How is momentum calculated?

  Momentum is equal to the mass of an object multiplied by its velocity.
• What would be the momentum of a 4,500 kg dinosaur charging at 12 m/s?

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

  30,000 kg m/s
• What type of quantity is momentum?

  Momentum is a vector quantity.
• If the forward direction is to the right, how would the momentum of the dinosaur and the car be classified?

  The dinosaur has positive momentum, while the car has 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 after the event.
• How do you find the total momentum before a collision between two objects?

  By adding together the momentums of both objects.
• What is the total momentum of a dinosaur with 54,000 kg m/s and a car with -30,000 kg m/s before a collision?

  24,000 kg m/s
• What does a positive total momentum indicate in this scenario?

  It indicates that the combined movement is to the right.
• How do you calculate the shared velocity of two colliding objects after they stick together?

  By rearranging the momentum equation to show that velocity equals momentum divided by mass.
• What is the combined mass of a 4,500 kg dinosaur and a 1,200 kg car?

  5,700 kg
• What is the velocity of the combined dinosaur and car after the collision if their total momentum is 24,000 kg m/s?

  4.4 m/s to the right
• What happens to momentum when stationary objects are involved in a collision?

  The total momentum before and after the event must be zero.
• What is the initial momentum of a gun before it is fired?

  Zero
• What happens to the momentum of the gun and bullet after the gun is fired?

  The gun recoils backwards with an equal momentum to the bullet's forward momentum.
• How do you find the bullet's momentum if it has a mass of 5 grams and a velocity of 120 m/s?

  By calculating 0.005 kg times 120 m/s, which equals 0.6 kg m/s.
• What is the equation for the gun's momentum if its mass is 2 kg and its velocity is unknown?

  The momentum is represented as 2v, where v is the gun's velocity.
• How do you set up the equation to find the gun's recoil velocity after firing?

  By writing 2v + 0.6 = 0, where 0.6 is the bullet's momentum.
• What is the recoil velocity of the gun if its momentum plus the bullet's momentum equals zero?

  -0.3 m/s
• What does a negative recoil velocity indicate about the gun's movement?

  It indicates that the gun is moving backwards.
• What is the symbol for momentum in physics?

  The symbol for momentum is p.
• How can the momentum equation be expressed using its symbol?

  The momentum equation can be written as p = mv.
• What are the key concepts related to momentum discussed in the video?

  • Momentum is a property of moving objects.
  • Momentum is calculated as mass multiplied by velocity.
  • Momentum is a vector quantity with magnitude and direction.
  • The conservation of momentum principle states that total momentum before an event equals total momentum after the event.
• What are the steps to calculate the recoil velocity of a gun after firing a bullet?

  1. Calculate the bullet's momentum using its mass and velocity.
  2. Set up the equation for the gun's momentum plus bullet's momentum equals zero.
  3. Rearrange the equation to solve for the gun's velocity.