Physics - 10 Force and Motion - 10.7 Safety First & 10.8 Forces and Elasticity

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12 Terms

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Safety helmet [3]

- increases impact time
- therefore decreases rate of change of momentum
- therefore decreases impact force and risk of injury

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Car safety features [3]

- crumple zones
- seat belts
- air bags

3
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Seat belt [4]

- increases impact time
- therefore decreases rate of change of momentum
- therefore decreases impact force and risk of injury
- spreads force out over chest

4
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Air bag [4]

- increases impact time
- therefore decreases rate of change of momentum
- therefore decreases impact force and risk of injury
- spreads force out over upper body

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- Thinking distance is ... to speed
- Braking distance is ... to ... speed

- proportional
- proportional, the square of

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Crash mat [3]

- increases impact time
- therefore decreases rate of change of momentum
- therefore decreases impact force and risk of injury

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Elastic

ability of an object to return to its original shape when forces deforming it are removed

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Extension

increase of length from original length

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Hooke's law

extension is directly proportional to force unless the limit of proportionality is exceeded

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Limit of proportionality

limit beyond which an elastic object's extension is no longer proportional to the force that deforms it

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Elastic limit

maximum stress a material can withstand without permanent deformation

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Hooke's law equation

F = ke