physics question

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  • mrsleeve
    I waste 90% of my day here and all I got was this stupid title
    • Mar 2005
    • 16385
    #46
    ^^^^^^^^^^^^^^

    Right so you drop from 32 feet it falls for 1 second so when lands generates 16000lbs of force.

    If am wrong I am wrong Its been a long time since I have had to think about anything like this, guess I am very rusty.
    Originally posted by Fusion
    If a car is the epitome of freedom, than an electric car is house arrest with your wife titty fucking your next door neighbor.
    The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money. -Alexis de Tocqueville


    The Desire to Save Humanity is Always a False Front for the Urge to Rule it- H. L. Mencken

    Necessity is the plea for every infringement of human freedom. It is the argument of tyrants.
    William Pitt-

      Comment

      • LivingLegend06
        E30 Mastermind
        • Dec 2006
        • 1604
        #47
        NO, you are way off on all accounts and are making all kinds of incorrect assumptions and misusing units.

        please read the thread, we have already covered how this works.

          Comment

          • TwoJ's
            R3V Elite
            • Oct 2005
            • 4908
            #48
            mrsleeve... are you serious? Really?

            Do you even know what mass or weight or force really mean?

            And as was already stated, newton's second law is not true for inelastic collisions. So stop saying F = ma, because it doesn't.

              Comment

              • mrsleeve
                I waste 90% of my day here and all I got was this stupid title
                • Mar 2005
                • 16385
                #49
                Ok real world here, not a text book deal. I admit its been almost 13 years since I have even thought about such things the math is not there any more nor are the concepts,

                I guess the old saying holds true you dont use it you lose it. Ok I guess I am an idiot.
                Originally posted by Fusion
                If a car is the epitome of freedom, than an electric car is house arrest with your wife titty fucking your next door neighbor.
                The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money. -Alexis de Tocqueville


                The Desire to Save Humanity is Always a False Front for the Urge to Rule it- H. L. Mencken

                Necessity is the plea for every infringement of human freedom. It is the argument of tyrants.
                William Pitt-

                  Comment

                  • akorcovelos
                    E30 Enthusiast
                    • Dec 2006
                    • 1149
                    #50
                    posted on e30tech:
                    Originally posted by yesterdaylight
                    hmm try something around 14lbs

                    thats after figuring that the force is distributed over .01s. It's hard to calculate because you really really need the time interval. It will drastically change the answer.

                    m1v1 + Fdt = 0
                    so mSQRT(2gh) + Fdt = 0

                    solve for m
                    14 lbs is the same number we came up with, but it seemed really light.

                    2012 MCSCC/NSSCC CP class champ
                    HSAX Instructor

                      Comment

                      • TwoJ's
                        R3V Elite
                        • Oct 2005
                        • 4908
                        #51
                        sigh.

                        still using lbs. for mass are we?
                        Last edited by TwoJ's; 02-27-2008, 07:24 AM.

                          Comment

                          • e30pwr
                            Mod Crazy
                            • Oct 2007
                            • 642
                            #52
                            Alright. asked the AP Physics teacher and its just 500/32 = 15 and some change in slugs.

                            But he said if your talking 500lb of pressure you would need the surface area.

                              Comment

                              • TwoJ's
                                R3V Elite
                                • Oct 2005
                                • 4908
                                #53
                                That guy is teaching AP physics? Hmm... 500/32 would give you the mass of an object in static load with a normal force of 500lb.

                                He's got a case of too much newton's 2nd. Once again, that doesn't count here. When you go back to class tomorrow, ask him about impulse.

                                  Comment

                                  • e30pwr
                                    Mod Crazy
                                    • Oct 2007
                                    • 642
                                    #54
                                    I know about impulse. I've finished first semester but I'm wondering what exactly the question is. If it is for pressure or just the force?

                                    And I probably left something out. I didn't write it down or anything.

                                      Comment

                                      • TwoJ's
                                        R3V Elite
                                        • Oct 2005
                                        • 4908
                                        #55
                                        Yeah, the question at hand really doesn't leave anything to be realistically solved anyways.

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