According to safety standard for air bags, the maximum acceleration during a car crash should not exceed 60 g and should last for no more than 36 ms}. such a case, what force does the air bag exert on a 95.0 kg person? Start with a free-body diagram

Question

anonymous · Answer

$$F = m \cdot a$$Note that$$1 g = 9.81 {m \over s^2}$$

anonymous · Answer

g is gravity

anonymous · Answer

Indeed. But we can use gee's as a measure of relative acceleration, like here. 60 g of acceleration means the object is acceleration 60 times the acceleration of gravity.

anonymous · Answer

oh

anonymous · Answer

can u please show me what the free body diagram would look lilke

anonymous · Answer

So the Force is$$F = m \cdot 60 \cdot g$$where $g=9.81$

anonymous · Answer

I think you can figure that out. 

What forces act on the body?

anonymous · Answer

i mean |dw:1332730752286:dw|

anonymous · Answer

Sure. If the occupant is sitting in a seat in the car. 

Think about sitting in a car. Where is the air bag located? If you were involved in a head on collision, which direction would you be moving? Which direction must the air bag force act such that it stops you?

anonymous · Answer

so is this fbd suffiecient enough with amount of info i was given

anonymous · Answer

No. We are talking about the force an air bag exerts, where is your force of airbag in that diagram? 

Also a FBD ALWAYS has a coordinate system.

anonymous · Answer

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