momentum 1

• What is momentum?

  Momentum is a property that all moving objects have.
• How is momentum calculated?

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

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

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

  Momentum is a vector quantity.
• What does it mean that momentum has both magnitude and direction?

  It means that momentum can be positive or negative depending on the direction of motion.
• What is the conservation of momentum principle?

  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 a dinosaur and a car?

  By adding the dinosaur's momentum and the car's momentum together.
• What is the total momentum before the collision of the dinosaur and the car?

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

  A positive total momentum indicates that the direction of motion is to the right.
• How do you find the shared velocity after the dinosaur and car collide?

  By rearranging the momentum equation to show that velocity equals momentum divided by mass.
• What is the shared velocity of the dinosaur and car after the collision?

  The shared velocity is $4.4 \text{ m/s to the right}$.
• What happens to momentum when stationary objects are involved?

  Stationary objects have zero momentum before an event, and the total momentum after must also be zero.
• How does the gun's recoil relate to the bullet's momentum?

  The gun's momentum plus the bullet's momentum must equal zero.
• What is the momentum of a 5 gram bullet fired at 120 m/s?

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

  The gun's momentum can be expressed as $2v$, where $v$ is the velocity.
• How do you find the gun's recoil velocity?

  By rearranging the equation $2v +$$0.6 =$$0$ to find $v$.
• What is the recoil velocity of the gun?

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

  A negative recoil velocity indicates that the gun is moving backwards.
• What is the symbol for momentum?

  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 of momentum discussed in the video?

  • Momentum is mass multiplied by velocity.
  • Momentum is a vector quantity with magnitude and direction.
  • Conservation of momentum states total momentum before an event equals total momentum after.
  • Momentum can be zero for stationary objects.
  • The symbol for momentum is $p$.