Understanding Momentum and Safety in Vehicles

The video explains how seat belts save lives by discussing momentum and forces. It covers the calculation of momentum and force, using examples like an ostrich and a car crash. The video highlights the dangers of rapid momentum changes and how safety features like seat belts, airbags, and crumple zones reduce force by extending the time over which momentum changes occur.

What is the formula for calculating momentum?

• Momentum = Mass + Velocity

• Momentum = Mass x Velocity

• Momentum = Mass - Velocity

• Momentum = Mass / Velocity

Which of the following units is used to measure momentum?

• Joules

• Meters per second squared

• Kilogram meters per second

• Newton meters

Why are rapid changes in momentum considered dangerous?

• They have no effect on safety.

• They can cause large forces that may be harmful.

• They increase the speed of an object.

• They decrease the mass of an object.

In a car crash, what happens to the momentum of the passengers?

• It increases rapidly.

• It remains constant.

• It doubles.

• It decreases rapidly to zero.

How do you calculate the force acting on an object when its momentum changes?

• Force = Change in Momentum - Time

• Force = Change in Momentum + Time

• Force = Change in Momentum x Time

• Force = Change in Momentum / Time

If a 100 kg ostrich stops in 5 seconds from a speed of 8 m/s, what is the force required?

• 100 Newtons

• 200 Newtons

• 160 Newtons

• 80 Newtons

What is the force acting on a 70 kg person in a car that stops from 15 m/s in one second?

• 700 Newtons

• 1050 Newtons

• 1500 Newtons

• 500 Newtons

How do seat belts help in reducing the force during a crash?

• By increasing the speed of the car

• By decreasing the mass of the body

• By increasing the time over which the body slows down

• By reducing the distance traveled

What is the role of airbags in vehicle safety?

• They increase the mass of the vehicle.

• They increase the time over which momentum changes, reducing force.

• They reduce the distance the vehicle travels.

• They decrease the speed of the vehicle.

Which safety feature is designed to crumple and absorb energy during a crash?

• Airbags

• Brakes

• Seat belts

• Crumple zones