Is 4.7 g's safe?

I'm doing a physics project, and I have to build a roller coaster. At the bottom of the hill, the g's are 4.7, is that safe?

Depends on the duration? If its for a sustained amount of time that would be harmful.

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My teacher says that between 1-5 is safe, is 4.7 really bad?

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for a brief period, that shouldnt be to bad, but if it is over a long period of time, maybe more than a second, then it could be bad. best to keep the G's down for a little while after that as well.

thanks.

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You also have to consider the change in G-forces, if it is drastic(lots of positves to Negatives for example) that it could be dangerous.

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