What’s the g-force in a rally car?

Photograph by RX-Guru at German Wikipedia - Transferred from de.wikipedia to Commons., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2080303

Photograph by RX-Guru at German Wikipedia – Transferred from de.wikipedia to Commons., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2080303

An FIA rally-cross car can accelerate from 0-60 mph in 2 seconds.

Lets check equations of motion, first some definitions.
u – initial velocity
v – final velocity
a – acceleration
t – time
s – displacement

v = u + at
s = ut + ½at2
v2= u2+ 2as

BBC Bitesize resource on equations of motion.
—-

v is 60 mph is 26.8224 m/s
and average acceleration = 26.8224 / 2 = 13.4112 m/s^2
= 13.4112 / 9.80665 g
= 1.368 g
~ 1.4 g

Back calculating….

v = u + at
v = 0 + 13.4112 * 2

OK, in agreement with what we expected.

Distance travelled
s = ut + 1/2 * a t2
= 0 + 0.5 * 13.4112 * 4
= 2 * 13.4112
= 26.8224 m
~ 26.8 m

Rally car

By Foto: Stefan Brending, Lizenz: Creative Commons by-sa-3.0 de, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index.php?curid=35347288

One Response

  1. Reblogged this on DT & Engineering Teaching & Learning Blog and commented:
    Interesting article on g-force when a rally car is accelerating…

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