Motion & Force: Calculate Force from Car Collision w/ Abutment

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SUMMARY

The discussion focuses on calculating the force acting on a passenger's upper torso during a car collision with a bridge abutment. The car's initial speed is 48 km/h, and the passenger moves forward 53 cm before coming to rest, with a torso mass of 40 kg. Participants suggest using constant acceleration equations to determine acceleration, followed by applying Newton's second law, F = ma, to find the force. This approach avoids the use of kinetic energy equations.

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  • Understanding of constant acceleration equations
  • Familiarity with Newton's second law (F = ma)
  • Basic knowledge of unit conversions (km/h to m/s)
  • Concept of motion in physics
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Homework Statement


A car traveling at 48 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 53 cm (with respect to the road) while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's upper torso, which has a mass of 40 kg?


Homework Equations





The Attempt at a Solution


Any idea how to solve this without using kinetic energy equations?
 
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tjbateh said:
… Any idea how to solve this without using kinetic energy equations?

Hi tjbateh! :wink:

You have an initial speed, a final speed, and a distance, so use one of the constant acceleration equations to find the acceleration …

then use F = ma. :smile:
 
Last edited:

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