Change in Momentum

• How do safety features like seat belts reduce dangers?

  They reduce the dangers of changes in momentum
• Who is the target audience for this video?

  Triple physics students
• What is the formula for calculating momentum?

  Momentum = mass × velocity
• Why can rapid changes in momentum be dangerous?

  They can place huge forces on passengers
• What do crash tests help manufacturers design?

  Safety features like seat belts
• What happens to the momentum of passengers during a crash?

  It falls from a large amount to zero
• What is the relationship between force and momentum change?

  Force is the change in momentum divided by time
• What is the formula for calculating force?

  Force = mass × change in velocity / change in time
• What is another way to express change in momentum?

  Mass multiplied by change in velocity
• If a man has a mass of 100 kg and the car stops in 1 second, what is the change in velocity?

  30 meters per second
• What is the force experienced by a 100 kg man when a car stops in 1 second?

  3000 Newtons
• Why is a force of 3000 Newtons potentially fatal?

  It can cause serious injury or death
• What are the safety devices that slow down momentum change?

  • Airbags
  • Seatbelts
  • Crash mats
  • Bike helmets
  • Cushion surfaces in playgrounds
• How do safety devices reduce the risk of injury?

  They slow down momentum change and reduce forces
• Where can you find more questions on change in momentum?

  In the vision workbook linked above