momentum 2

• What is the formula for momentum?

  Momentum is equal to mass times velocity.
• How does applying a force affect an object's momentum?

  Applying a force can speed up or slow down an object, thus changing its momentum.
• If a 2 kg particle is traveling at 5 m/s, what is its momentum?

  The momentum is 10 kg·m/s.
• What is the new momentum of a 2 kg particle traveling at 8 m/s?

  The new momentum is 16 kg·m/s.
• What equation do we use to calculate the force required to change momentum?

  Force is equal to the change in momentum divided by the time over which the change took place.
• If the change in momentum is 6 kg·m/s and the time is 0.5 seconds, what is the force applied?

  The force applied is 12 newtons.
• What is the mass of the ball in the second example?

  The mass of the ball is 600 grams or 0.6 kg.
• What is the initial velocity of the ball in the second example?

  The initial velocity is 0 m/s because the ball starts at rest.
• How do you calculate the force required to accelerate a 600 gram ball to 14 m/s in 0.1 seconds?

  Force is calculated by taking the change in momentum and dividing it by the time.
• What is the final momentum of the ball when it reaches 14 m/s?

  The final momentum is 8.4 kg·m/s.
• Why is the change in momentum significant during car crashes?

  A massive change in momentum can cause a huge force, leading to injuries.
• What safety features are required in cars to reduce injury during crashes?

  • Crumple zones
  • Seat belts
  • Airbags
• How do crumple zones help in a car crash?

  Crumple zones absorb impact and increase the time for momentum to be lost.
• What are the functions of seat belts in a car?

  Seat belts prevent ejection from the car and help slow down the occupant more gradually.
• How do airbags contribute to safety in a car crash?

  Airbags compress like a pillow, helping to slow down the occupant more gradually.
• What is the key principle behind safety features in cars during crashes?

  • Increase the time for momentum to be lost
  • Result in lower force acting on the person
  • Reduce the risk of harm
• What is the overall goal of safety features in cars during a crash?

  The goal is to reduce the risk of harm to occupants.
• What is the final takeaway from the video?

  Safety features in cars help reduce the risk of injury during crashes.