Re: [ST] for Marc -

[Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx>]

But the point he's making can be demonstrated easily by the fact that 
you can skip a stone across water. If you just drop it the stone will 
fall at the same rate as the stone you skip. But the angle of contact 
changes the outcome dramatically.

On Jun 5, 2006, at 11:30 AM, Matthew Heyer wrote:

> regardless of the forward motion, on object will accelerate towards 
> the ground at the same rate under the pull of gravity (unless it has 
> wings or something something creating lift from a forward motion...).  
> So the force when hitting the ground will be identical whether moving 
> forward or not.  Your analogy ends up with two very different impact 
> speeds (falling from standing and falling from your roof do not have 
> the same acceleration distances - the object falling from the roof 
> will have more distance to accelerate and thus be moving faster 
> (normal to the ground) and thus have a greater normal force impact 
> with the ground.  To make the analogy you need to be running and fall 
> to the ground, or just standing and fall to the ground.  In that case, 
> the impact is the same.

Matt Knowles
Aesthetic Design & Photography - www.aestheticdesign.com - (707) 
786-4643

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