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This question was created from Offline Homework 3 Updated (3).pdf


Please explain how to use the graph to estimate the magnitude of the maximum force on the dummy for each possibility. Please also assist with part b.


Physics E-lax HW 3 H
G Unbelted occupant hit. duh 14
— Dash panel 12 — Unbelted occupant
— Belted occupant without 10 pretensioner or load limiter
— Belted occupant with pretensioner and load limiter Engine hits barrier Acceleration a .- IDNGI'I‘UDINAL VELOCITY (min) oboe-.630: 102030405080708090100110130
TMEAF'I‘ERIMPACMM) Figure 3. Velocity history of a dummy in the front passenger seat of a car, with
various belt restraints, in a 35-mph head-on test crash with a fixed barrier. The
red, leftmost Curve, representing the car's dash panel, has a maximum decelera-
tion of 273 about 60 milliseconds after impact. from “Vehicle Design and the Physics of Traffic Safety," Physics Today, Jan. 2006, p. 49 a) Assuming the dummy has a mass of 70 kg, use the graph to estimate the magnitude of the maximum
force on the dummy during the collision for each of the three possibilities: the safetymseatbelt, the
ordinary seatbelt, and no seatbelt. b) Serious tissue injury occurs if the impact force per unit area exceeds about 5 >< 1D5 Nam—2. Assuming that the forces in (a) are distributed over an area of about 500 cm2, comment on the severity of the injuries
that would likely be sustained in each of the three possible types of impact.

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