Read E-49

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Read E-49
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Activity 84

• Title Decelerating Safely
• Problem How can a persons deceleration be
  controlled during a collision?
• Hypothesis If _____, then __________.

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How do you know when you are accelerating while
traveling in a car?

• Starting up from a stoplight.
• Passing a vehicle.
• Acceleration is happening when you have the
  feeling of being pushed back in the seat while
  the car accelerates forward.

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How do you know when you are decelerating while
traveling in a car?

• When a car comes to a stop, it will make
  passengers feel like they are thrown forward as
  the car decelerates.

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Talking Drawing Safety Features

• Close your eyes and think about what a safe
  vehicle looks like. Now, open your eyes and draw
  what you imagined. Label any parts of the vehicle
  that have special features.

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Three Level Reading Guide

• Check the statements that are correct in the
  first two sections.
• In the third section, check the statements that
  you believe are correct.

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Talking Drawing Part II

• Redraw your safe car with added safety features
  that you read about.

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Analysis Question 1

• What did you pick?
• On impact, the car decelerates very rapidly, but
  inertia keeps objects within the car, including
  people, moving at a higher speed.
• How does your chosen safety feature help
  decelerate the body more gradually, so that there
  is an increase in time and a reduction in force?

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Analysis Question 3

• Tires are designed to optimize the friction
  between them and the road so that the car gets
  good traction, handles well, and can stop
  quickly.
• As tires wear down, their ability to do all these
  safety-related things decreases and the braking
  distance increases.

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Analysis Question 4

• Some of the factors that tend to keep the
  fatality rate about the same are
• More distractions, such as cell phones and
  hand-held electronic devices
• A larger number of older drivers
• Lack of seatbelt use (almost 40 of all
  passengers killed are not wearing seatbelts)
• Reintroduction of higher speed limits
• Less car uniformity (mass, bumper height) when
  vehicles collide