Google+

Archive for the ‘Acceleration’ Category

February 18, 2015 · by physics · Acceleration

Test Problem Example:

A warehouse worker pushes a 10 kilogram crate along the frictionless floor, as shown in the figure,by a force of 10 Newtons that points downward at an angle of 40 degrees below the horizontal.

A. (10 points) Draw a free-body diagram for the crate.

B.  (10 points) Find the acceleration of the crate.

Raw Transcript

Hello, Tom from everystepphysics.com and everystepcalculus.com. Physics problem off of a test. A warehouse worker pushes a 10 kilogram crate along the frictionless floor, as shown in the figure,by a force of 10 Newtons that points downward at an angle of 40 degrees below the horizontal.A for 10 points, draw a free-body diagram for the crate. B for 10 points, find the accelerationof the crate. So let’s do what my programs can do. Physics to get to my menu. Choose number 2, acceleration, because that’s what the problem asks for. We’re going to scroll down, you have to get a little practice of it because there’s many menus down here for choices and stuff. So you have to practice with my programs more than you practice with the sample tests given by the professor, or the book itself, or anything. So what’s given? What’s given is mass, the angle, and the force. And newtons. Not the friction force but the, the force, okay. We’re going to choose that. Press alpha before you enter anything into the entry lines, here. Alpha mass is given at 10 kilograms. 10 kilograms. The force is given too. Alpha 10 newtons. Angle is given at alpha 40 degrees. I always show you what you’ve entered, you can change it if you want. I say it’s okay. Here’s the formula for acceleration. The force times cosine of theta minus mg times the sine of theta, the whole thing divided by mass. Here’s the calculations all entered into that formula. Here’s the answer minus 5.5397 meters per second squared. With regard to the free body diagram. I’ll just say a couple things about that or a few things. The arrow points straight down always perpendicular to the horizontal is called the gravity force. The horizontal force is the arrow to the exact right along the horizontal. It’s called the horizontal force. The arrow pointing left which you would draw on this box and that is, that is the friction force. And the arrow pointing straight up is called a normal force. The arrow with the ten newtons is called the applied force. So you write that down, you get 10 points on your problem, on your test. And you’re going to pass that class or it’ll certainly help to pass the class. Have a good one.
September 26, 2014 · by physics · Acceleration, Physics Help

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?

Raw Transcript
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

January 13, 2014 · by physics · Acceleration, Collisions, Momentum

Popeye, of mass 70kg has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700kg (Bluto is very dense), who is charging in at 10 m/s. What was Popeye’s speed?

a. 10 m/s
b. 31 m/s
c. 50 m/s
d. 100 m/s

Raw Transcript

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.

November 9, 2013 · by physics · Acceleration

 

Acceleration & Kinetic Friction in Physics for the  TI-89: Video Transcript

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

· by physics · Acceleration, Tension

 

Tension Pulling or Pushing on the TI-89: Video Transcript

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

· by physics · Acceleration

 

Acceleration with 3 Masses on TI-89: Video Transcript

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

October 20, 2012 · by physics · Acceleration, Physics Help

 Raw Transcript

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