PHYSICS - Forces - Changes in Momentum

This video tutorial explains the concept of momentum, its calculation, and the dangers of rapid changes in momentum, such as in car crashes. It demonstrates how to calculate force from changes in momentum and discusses safety measures like seatbelts and airbags that reduce force by extending the time over which momentum changes occur.

What is the momentum of a 100 kg ostrich moving at 8 m/s?

• 100 kg m/s

• 800 kg m/s

• 8 kg m/s

• 0 kg m/s

Which of the following is a consequence of rapid changes in momentum?

• Reduced force

• Increased speed

• Potential for serious injury

• Improved vehicle performance

How is force calculated when there is a change in momentum?

• Force equals mass times velocity

• Force equals change in momentum divided by time

• Force equals velocity divided by time

• Force equals mass divided by velocity

What is the force required to stop a 100 kg ostrich moving at 8 m/s in 5 seconds?

• 160 Newtons

• 80 Newtons

• 200 Newtons

• 100 Newtons

How do seat belts help reduce the force experienced during a crash?

• By increasing the speed of the vehicle

• By reducing the velocity of the vehicle

• By increasing the time over which momentum changes

• By decreasing the mass of the passengers