Impulse Introduction or If You Don't Bend Your Knees When Stepping off a Wall

The video tutorial explores the physics of impact when stepping off a wall, focusing on the importance of bending knees to increase collision time and reduce force. It explains the concepts of momentum, impulse, and their calculations, using examples like seatbelts and airbags to illustrate how increasing collision time can decrease impact force. The tutorial emphasizes the unchanged impulse regardless of knee bending and highlights the practical applications of these physics principles in everyday safety devices.

What is the primary reason for bending knees when stepping off a wall?

• To decrease the force of impact

• To increase the force of impact

• To decrease the change in time

• To increase the final velocity

Which of the following is true about impulse?

• Impulse is only the change in momentum

• Impulse is only net force times change in time

• Impulse is both change in momentum and net force times change in time

• Impulse is unrelated to momentum

What is the unit of impulse?

• Joules

• Newtons times seconds

• Meters per second

• Kilograms

How does not bending your knees affect the net force during impact?

• It decreases the net force

• It increases the net force

• It makes the net force zero

• It has no effect on the net force

What was used to estimate the time of collision in the experiment?

• A basketball

• A tomato

• A rubber ball

• A piece of foam

What happens to the force of impact if the time of collision is reduced?

• The force of impact becomes zero

• The force of impact decreases

• The force of impact increases

• The force of impact remains the same

Which of the following is an example of increasing collision time to reduce impact force?

• Driving faster

• Wearing a seatbelt

• Using a heavier vehicle

• Removing airbags