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<blockquote data-quote="JohnDeere8530" data-source="post: 755012" data-attributes="member: 170"><p>Yes , A car doing 50 mph running up the back of a lorry would have a vastly greater amount of energy than a lorry reversing into a loading bay and hitting a wall. By the tune of about 5 fold my guess would be. You underestimate how much energy is actually contained in a speeding car, far more than a lorry reversing at a slower pace</p><p></p><p>What im saying is The design of these rear ram bars are inadequate to stop a fast moving car, the spec of them is more akin to act as a nudge bar when reversing. I agree this is wrong; however design limitations prevent it from crumpling when hit fast</p><p></p><p>Remember the energy stored in a moving system is proportional to mv^2. Ie a 44 tonne lorry reversing at say 5 mph would have around 1/5th of the energy of a car travelling at say 50 mph</p></blockquote><p></p>
[QUOTE="JohnDeere8530, post: 755012, member: 170"] Yes , A car doing 50 mph running up the back of a lorry would have a vastly greater amount of energy than a lorry reversing into a loading bay and hitting a wall. By the tune of about 5 fold my guess would be. You underestimate how much energy is actually contained in a speeding car, far more than a lorry reversing at a slower pace What im saying is The design of these rear ram bars are inadequate to stop a fast moving car, the spec of them is more akin to act as a nudge bar when reversing. I agree this is wrong; however design limitations prevent it from crumpling when hit fast Remember the energy stored in a moving system is proportional to mv^2. Ie a 44 tonne lorry reversing at say 5 mph would have around 1/5th of the energy of a car travelling at say 50 mph [/QUOTE]
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