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Vine of Messick's Taking a Defender to the Ground
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<blockquote data-quote="GTpdm" data-source="post: 75828" data-attributes="member: 1451"><p>(Physics nerd chiming in...) NavyNuke is pretty much spot-on here, although his formal "physics-jargon" leaves a little to be desired. That's okay though—it's not like anyone is going to have an exam on this stuff or anything (although my students have one tomorrow).</p><p></p><p>In a collision, the forces <u>between</u> the two colliding players certainly are equal in magnitude (by the 3rd law of motion), BUT if Messisk is planted with both feet squarely on the ground when the collision occurs, then he has <u>more</u> that just the collision force acting on him; the ground is pushing forward against him in equal measure to the force with which his legs are pushing back (i.e. bracing) against the ground (3rd law again). The DB, on the other hand, looks to be caught in mid-stride, and is probably not in a position to brace himself against the ground—he can't push back strongly against the ground, so the ground can't push forward strongly against the DB (there's that 3rd law again).</p><p></p><p>Once we have a handle on the <u>net</u> force that is acting on each player, it is easy to understand their motion. The DB has a large, unbalanced force acting on him (the collision force, plus maybe only a weak opposing force by the ground): BAM—total momentum kill. Messick, on the other hand, is experiencing opposing forces that are approximately in balance: his overall momentum is hardly changed, although he does pay a price for that, in the form of a large compressional load on his body—in essence, the two forces are trying to squash him in place, rather than move him anywhere. As long as his frame is able to sustain the load, he stays upright.</p><p></p><p>[Sorry....I saw physics mentioned and I couldn't stop myself....]</p></blockquote><p></p>
[QUOTE="GTpdm, post: 75828, member: 1451"] (Physics nerd chiming in...) NavyNuke is pretty much spot-on here, although his formal "physics-jargon" leaves a little to be desired. That's okay though—it's not like anyone is going to have an exam on this stuff or anything (although my students have one tomorrow). In a collision, the forces [U]between[/U] the two colliding players certainly are equal in magnitude (by the 3rd law of motion), BUT if Messisk is planted with both feet squarely on the ground when the collision occurs, then he has [U]more[/U] that just the collision force acting on him; the ground is pushing forward against him in equal measure to the force with which his legs are pushing back (i.e. bracing) against the ground (3rd law again). The DB, on the other hand, looks to be caught in mid-stride, and is probably not in a position to brace himself against the ground—he can't push back strongly against the ground, so the ground can't push forward strongly against the DB (there's that 3rd law again). Once we have a handle on the [U]net[/U] force that is acting on each player, it is easy to understand their motion. The DB has a large, unbalanced force acting on him (the collision force, plus maybe only a weak opposing force by the ground): BAM—total momentum kill. Messick, on the other hand, is experiencing opposing forces that are approximately in balance: his overall momentum is hardly changed, although he does pay a price for that, in the form of a large compressional load on his body—in essence, the two forces are trying to squash him in place, rather than move him anywhere. As long as his frame is able to sustain the load, he stays upright. [Sorry....I saw physics mentioned and I couldn't stop myself....] [/QUOTE]
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Vine of Messick's Taking a Defender to the Ground
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