Hello, Everyone. Tom from everystepphysics.com and everystepcalculus.com. I going to do another physics problem. I’ll read it. A European sports car dealer claims that this product will accelerate at a constant rate from rest to a speed of 100 kilometers per hour in eight seconds. What is the speed after the first five seconds of acceleration? So, let’s do it. Physics to get into my menu. Open closed parentheses. That tells a calculator you want to do a program. And we’re going to go because I want you to circle things, what’s asked for in the problem and I want you to write on the right, I want to write was given so you keep clear mind of everything. In this case was speed. Speed velocity is the same. Just for your information, velocity is a vector can be negative or go in any direction. Speed is a scaler and it’s only positive, you can never have it negative. But otherwise they’re essentially the same. So we’re going to, I’m going scroll up to go to the bottom on the menu here and I’m going to scroll up to speed. Right there. And then we choose what’s given. Well and what’s given is final velocity in time. So I’m gonna go up in the menu here and see if that’s in here. And here’s velocity and time, right here. Choose that. They’ve given you initial velocity or final velocity. So you press Alpha, press Alpha first before entering anything into the entry lines. Alpha 100. And notice they give you kilometers, change the meters per second. So I do that for you. You write this on your page do the conversion. And is acceleration given? No. No acceleration is given. Okay and then Alpha. Alpha and what time was given. Eight seconds. So then I do the acceleration for you here it is right here. And then is another time given. I say yes. So I’m going to go Alpha five. And here’s the answer for the test problem. 17.4 meters per second. Pretty neat, huh? everystepphysics.com Go to my site, buy my programs and maybe subscribe for more videos. Thank you

b. 31 m/s

c. 50 m/s

d. 100 m/s

Hello this is Tom from every step physics dot com going to an actual physics problem from a test final

and I’m gonna do number nine here on this sheet, I’ll show you the sheet let’s do it I’m going to scroll down to collisions and this next one in the problem it says that he stops Bluto so that word is a key one whether it’s a momentum or collision problem. Now this is a special collision problem because when it says stop that means that both of the well after they hit they stick together and stop so that means that

the final velocities are 0 for both of them so it’s a special momentum problem maybe a trick problem

a lot of trick problems in physics as if physics wasn’t hard enough and we’re gonna find what are we gonna find we’re gonna find Popeyes initial…um velocity so we’re going to choose Vi1…we’re going to enter the mass Alpha is 0:00 kilograms, you have to press alpha to enter anything into my entry lines here and Bluto is 700 kilograms initial velocity of Bluto is 10…Bluto is 10 meters per second oops, press Alpha first and he’s going to the left, Popeyes going to the right so we choose -x axes and you can see if it’s correct, which it is, you can change it if you you wanted and so the momentum of Pluto is mass times velocity which is his mass is 700 plus that which is minus 7000 kilograms meters meters per second and since one of the laws of physics is that p1 plus p2 equals zero, so we enter that in the equation and then we solve for p1 with becomes a positive 7,000 that’s what the momentum of Popeye is and so we do the calculations here we come up with 100 meters per second for Popeye which is on the test you just circle that one and get a hundred percent on problems like that, pretty neat huh? every step physics dot com.

Ok this is a video on acceleration with regards to physics

and how my programs work on the ti-89 titanium calculator

let’s get started here you have to press second alplha in my programs

after you buy my programs to put in the **p h y s i c s** letters

and then you have to press alpha again to put in the open and closed parenthesis

in here press enter and you’re into my menu

you have many choices of course everythings always menu driven

atwood machine baseball hits

and all kinds of things but right now we’re interested in acceleration

so, that’s what were going to choose here and notice we have angular

centripetal and tangential acceleration if you want to go right to them

otherwise we’re going to go to acceleration whereby you know you need to find acceleration

because of what the test question was and so here’s, and of course they give you

the variables, and there is a million of them so I put them all here in alphebetical order

and uhm, you can scroll down to what they give you

right now let’s just do mass, coefficient of kinetic friction and

the angle Probably of a ramp

mass sliding down a ramp or something and of course you have to press alplha before

we enter anything into the entry lines I’m going to press alpha and put in eight

they give you the choice of grams or kilograms and I choose the number before it for kilograms

or I can scroll to it coefficient of kinetic friction i’m going

to push alpha, point six maybe

and then the angle, alplha twenty four degrees and I show you what you’ve entered

you can change it if you want I say it’s ok

here’s the equation, the original equation You always want to throw this down

and because the mass cancels a big deal in physics

the masses on both sides of the equation algebracially you can cancel it

and here’s the real equation for acceleration you mark this on your paper

that’s the first thing you mark down of course and you got three points credit right then

and here’s the actual formula and then you enter the variables that you

put in here and here’s the answer

a minus one point three eight seven meters per second squared

pretty neat huh every step physics dot com

go to my site buy my programs and pass your physics tests and class

This is a video on acceleration in physics

and ah given regarding maybe tension when you

something is pushing or pulling with some tension

let’s get started you press second alpha

to put the letters p h y s i c s in here and press alpha again to put the

open and closed parenthesis press enter and you are into my menu

we’re doing acceleration here you can see the number of choices you have

and we can go for all kinds of work all kinds of things in my menus

regarding physics and press two to get into acceleration

press one to get into the next menu for acceleration

and we have the choice of generally in a test your given or asked

to find acceleration and therefore you go to acceleration

in my programs and you scroll down to something with tension

here you have tension with ah coefficient of kenetic friction

so we’re going to do that one ah they give you mass

you have to press alpha before you enter anything into my program entry lines here

press alpha put in eight give you the choice of kilograms or grams

tension let’s say alpha fourty two newtons the angle is alplha maybe thirteen point five

degrees and the coefficient of kenetic friction might

be point one seven five

I always show you what you’ve entered so you can change it make sure you got it right

from what’s given I say it’s ok

here’s the formula you write this down on your paper

physics is scored on partial credit and class curve

so whatever you write down you get credit for

but you’re going to get one hundred percent on this problem

the unknowns are put in for that formula you’re doing the calculations just like you

would on paper

write everything down just like you see it and i give it to you in fraction format

and also in five rounded decimal points to meters per second squared

pretty neat huh every step physics dot com

go to my site buy my programs

and pass physics

This is a video from every step physics dot com

solving a physics problem step by step and also demonstrating

how my downloadable programs work in your TI 89 Titanium calculator

and other TI calculators for calculus and physics problems

and let’s get started here you have to press second alpha

to put the letters p h y s i c s in the main entry line of the calculator

and then press alpha and put the open and closed parenthesis

press enter and you’re into my menu ah there is many things that you can scroll

down to but we’re interested in acceleration right

now so I’m going to click on that

I give you individual accelerations here but we want to do a regular one

what happens is when you get a calculus I mean a physics problem in your test

and it says find acceleration well then you go to acceleration in my menu

here and I give you

uhm all the choices I know about which would come up to in a test problem

and right now we’re gonna maybe do even like this one

how many could answer this one where you have three masses and some force

that they give you pretty simple but

still on your test you might get confused or what ever and you want to get

this done quick and get onto the next problem so that’s what you do

I press Enter you have to press alpha before you enter

anything in these entry lines here alpha eight kilograms

alpha nine kilograms and alpha let’s say fourteen

grams and then the force alpha maybe

fourtyfive newtons I show you what you’ve entered

notice how I changed the grams to kilograms for you

and I give you the choice to change it and here is the full formula right here

simple as this and gives you the calculations

two point six four four nine ah pretty neat huh

every step physics dot com go to my site

buy my programs and pass physics

Ok, a video on physics help. You’ve searched for that so here it is. My programs are one of a kind in the area of physics as far as I’m concerned, there is none like them, and they’re not designed to teach you they’re designed for you to pass a physics class. You and I are not interested in the conservation of energy, or masses moving up or down a ramp, or Newton’s second law, even though to me, in my studies, Newton was a God. Remember a physics class is scored on curve and potential, or partial credit, and in my physics class, the curve was twenty seven, and I got an A, with a twenty eight, do in most part to my programs. In physics, physics problems ask you to find something, like acceleration, force, work or something, and then it gives you some variables, ya know like mass or velocity to work with. Well in my programs, you use my menu to what is asked for to find also, and then I give you the choice of variables because of the different formulas involved. So let’s get started. Uhm in my, I’m going to go back to the main screen here. You’ll notice the physics with the closed parenthesis, you have to push second alpha, and then put the letters p h y s i c s in there, and then you have to press alpha, and then put the closed parenthesis in, and then press enter, and up comes my menu, and this menu has many, many things, you can see the arrow here which goes way down to all kinds of things, fluids, hydraulics, center of mass, anything you might, ahh I can’t get everything in there because of the Titanium’s restriction on memory, ya know memory, allowances, so, but anyways let’s do a quick example here. Lets go to acceleration, and we’re going to put acceleration in. now when you go down the menu, here’s the arrow again, you can go way down here, you are given many, many choices for acceleration, all kinds of different formulas, and you pick out the one given in your problem. Let’s say that it gave you this one here, number eight, you can press eight and it’ll go, and I always show you this, a equals acceleration, this is a funny a, not a real a, it’s designed to do that in physics books, and here’s the formula, and ah, we’re going to enter the mass, let’s go, you have to press alpha before you enter anything, let’s go fifteen, I always give you this, this is pretty neat because I’ll give you all the choices for, sometimes a problem will say grams, or sometimes it will say kilograms, uhm and I give you those choices as you go through any problems or programs that I have. I’m going to say its kilograms, I’m going to show you how it changes in a second. And then let’s put an angle of twenty three degrees in there, and there’s friction force, we’re going to push alpha and then put forty five in there, newtons, and I show you what you’ve entered, but let’s just for experimental sake, change the fifteen grams, let’s say, so I’ll give you that choice, let’s go back and change it. And we’re going to put the mass of alpha fifteen, and let’s say that it’s grams this time, ok? And then we’re going to enter our angle which is alpha twenty three, and then our friction force which is alpha forty five newtons. You notice that I’ve changed it by dividing by a thousand, you can mess that up in your test or homework, so I do that for you, for me also, these programs were designed for me first remember? and we’re going to say ok, so here is, and you write all of this down, a equals acceleration, here’s the formula first, you put in the gravity, you put in the sign of twenty three, minus forty five, is the friction force, and here’s the mass, and etcetera , and you just go through it and put it in here, and you come up with the answer, minus two nine, nine, six point two meters per second squared, anytime you are dealing with friction force, I don’t mean to teach anything but, it’s negative because it’s opposite of the friction force, so pretty neat huh? Check out my site, check out my programs. www.everystepphysics.com