In thrill machine rides at amusement park , there can be an acceleration of 3g or more . But with out head rests, acceleration like this would not be safe. Think why not?
2 answers
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What is the mass of your head?
multiply that by 3 * 9.81 or about 30 Newtons force per kilogram
to be provided by your neck to keep your head attached.
multiply that by 3 * 9.81 or about 30 Newtons force per kilogram
to be provided by your neck to keep your head attached.