GCSE Physics - Momentum Part 2 of 2 - Changes in Momentum #60

The video tutorial explains how forces can change an object's momentum, using the formula that relates force to the change in momentum over time. It provides examples of calculating force required to change momentum and discusses the importance of momentum in car crashes, highlighting safety features like crumple zones, seatbelts, and airbags that help reduce injury by extending the time over which momentum changes.

What happens to an object's momentum if a force is applied in the same direction as its motion?

• The momentum increases.

• The object stops moving.

• The momentum decreases.

• The momentum remains unchanged.

How do you calculate the force required to change an object's momentum?

• Subtract the time from the change in momentum.

• Add the change in momentum to the time.

• Divide the change in momentum by the time.

• Multiply the change in momentum by the time.

In the example of the 2 kg particle, what was the initial momentum?

• 20 kg m/s

• 15 kg m/s

• 5 kg m/s

• 10 kg m/s

What is the final momentum of a 600 gram ball accelerated to 14 m/s?

• 7.2 kg m/s

• 5.4 kg m/s

• 6.0 kg m/s

• 8.4 kg m/s

How much force is required to accelerate a 600 gram ball from rest to 14 m/s in 0.1 seconds?

• 84 N

• 72 N

• 60 N

• 48 N

Why are crumple zones important in car safety?

• They increase the time over which momentum is lost.

• They decrease the time of impact.

• They allow the car to stop suddenly.

• They increase the car's speed during a crash.

What is the primary function of airbags in a vehicle?

• To increase the car's speed.

• To provide a hard surface during impact.

• To help lose momentum more slowly.

• To stop the car instantly.