Physics 163

Unit 4: Momentum and Collisions

Problem Set A

Problem 9:

Air bags are designed to protect passengers during collisions by extending the time of impact. A force of 64.5 Newtons is required to stop a moving passenger in 0.9 seconds with an airbag. The amount of time required without an airbag is 20 times less. What would be the force of impact (in Newtons) without an airbag?

• Read the problem carefully and diagram the physical situation
• Identify known and unknown information in an organized manner
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Momentum and collision principles can be reviewed on the Set A Overview page.

Further information about the effect of alterations in time upon the amount of force encountered in a collision is available online at The Physics Classroom.

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