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5-steps for solving 1-D kinematics using the 3 equations #2

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Lecture to a different period about using the 3 kinematic equations to solve 1_D problems.

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can we go Dunkin five-step method to get any May 25th of April Step 1 something really cheesy but an airplane drop box with wheels it's a horse running to box with wheels did your mom box with wheels whatever it is Step2 write down the five variables satb idea if you want to use Delta X instead of s whatever step 3 write down what you know don't know best say you'll do a problem they say the thing accelerates at 8 meters per second it has a starting velocity of 80 miles an hour what we don't do miles we do thank you for getting clobbered you're going to convert it to if it gives you an hour if you're going to convert it to Second thank you immediately go to kilograms meters seconds and life is easy this last your homework problems here went ahead and give you a number things they said you went 78 kilometers per hour but then they give you an acceleration meters per second and then people wonder why didn't work out well step 3 I just said you need three of the five the reason you need three of the five is because when you guess an equation you're going to find out that the each equation has four variables you have four variables you need to know three of the four in order to soften the one on own if you have one equation into a known to can't solve it step 5 data to Gaston equation when I say get I literally mean guess I have literally seen students it for like 50 seconds going should I choose one it would only take 20 seconds to actually just doesn't work try another one doesn't work again see the third one. What the numbers in that you got from Step 2 and do it plug and chug is like making Kool-Aid it is impossible to mess up grab a milk carton please rinse it out get rid of the milk I personally do not like making Kool-Aid flavor that's the strawberry that's not bad called Nesquik strawberry Nesquik It's My Kool-Aid it's like 95% sure no wonder I liked it so I'm a little hyper now oh well but now I don't meet at the moment so I'll maybe I am at the moment but I just meant in general milk so you have your own container of milk what are the packet add about a cup or two of sugar depending on you too sweet for me is that enough to sweeten up to around you can't mess up miss the five-step method hear you not to think about it let me try and demonstrate this method by solving for songs from of homework last night and to see the car is the freeway is that the right one Coroner's the freeway with a speed of 6.4 meters per second sorry got a car got it 6.4 meters per second and accelerates uniformly for 3.2 km course we don't do 3.2 we do 3200 in three and a half minutes we don't do minutes we do seconds 3 and 1/2 minutes would be I think to 10 seconds how fast is the car going after this time was the final velocity that's step one step two s a t v i BF step 3 plugging in Cas is 3200 acceleration I don't know time to 10 starting velocity 6.5 final velocity from looking for I know SI no TI No VI I know 3 or 5 so I'm able to to move on if I only know to I need to reread the question cuz what time's our stuff is hidden in there it's not really sort of this changes the car starts from rest well they didn't say that the starting velocity was 0 bit what do you think rest means how far I go before it comes to a stop sign bolasie was 0 but that's what stop means and I'll die falling from a tree well it's falling to the acceleration of gravity is 9.8 meters per second it's understood queso Augustine equation x equals 1/2 80 squared step 5 plug and chug plug it in check it out show me where the nearest 3200 equals 1/2 a 210 squared + 60 4 * 210 queso phone numbers in 3200 equals 22050 what times acceleration + 1344 will solve for a and we will get that 8 equal to so I go ahead and plug it on in ice off of it for a x the 210 seconds have a 6.4 and 24.08 I think the book says 24 need a finger count please on the to see number one is another example a car accelerates uniformly from rest 0k from years per second sing accelerates uniformly means that you're not like this on the gas pedal I hope I'm not stepping on the brakes just kind of step on the gas all the way you do it normally to a speed of 2723.7 km per hour you time of 6 and 1/2 seconds now course we don't deal, store hours deal with meters per second so let me do the little conversion okay there it is Step 2 right right right two variables. And I want you to write the down vertically like this not what I'm about to tell you is not to brag okay I want to send two step to satv IVF now I plug it in let's see how far did I go turn on acceleration maritime you know this place I'm not writing seconds converted it was 0 final velocity was 6.58 all three of the five so I'm ready to go on to the next step which of course is to Simply guessing equation can you play some gas for the day will be VF + VI + 80 equals BF is equal to VI Plus 80 I see final velocity 6.5 8 starting velocity of 0 acceleration is unknown and the time is 6.5 therefore we're going to acceleration of a body 6.58 3 3 3 yep 1.01 I'll try remember the question Ashley was it does not actually give us the answer but I will tell you this you have to always know the a because all three of your equations have an A in it that's equals 1/2 a t squared plus b i t v f equals the eye + 80 via squared equals y squared plus to a s you always have to know eggs and every one of them so now you know a what's use that how about this one via squared is equal to I squared + 2 as I'm over that was Zero and that was 1.01 the Apolis okay six point 5/8 squared or in Sulphur s 2143 know your answer me very slightly different I mean number to Captain your calculator the acceleration was 1.01 really 1.01 blah blah blah. You might have me on 2141 but what I'll do then on the test as I'll say gosh this is the answer and I'll give you plus or minus a safe or there is a between 2139 and 2147 is fine anything else is wrong I know where to slice it you guys of course we'll always know circumstances right how many decimal points to 2.42 significant figures please no if you worked it out and your acceleration worked out to be .0 873-215-8292 calculator you have to write this at least that .09 this is just this first all here this is for zero just a placeholder students do this I went to decimal points president rounded off right what you got to go at least two question

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5-steps for solving 1-D kinematics using the 3 equations #2

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