# physics

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In thrill machine rides at amusement parks ,there can be an acceleration of 3g or more .But without head rests ,acceleration like this would not be safe.think why not?

• physics -

• physics -

when our body takes off at 3g of acceleration,it will cause the neck to move also along with the whole body.A forcful jerk can cause a serious injury to our neck,That's why without head rest,we are not safe

• College physics -

when our body takes off at 3g of acceleration,it will cause the neck to move also along with the whole body.A forcful jerk can cause a serious injury to our neck,That's why without head rest,we are not safe

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