![impulsive force model worksheet 1 answers impulsive force model worksheet 1 answers](https://s1.studyres.com/store/data/010461457_1-063f13ce457d70cda7f870e8ff052385.png)
The change in momentum in the X direction. Initial velocity in the X, and the final velocity in the X, and I take the difference in momentum, what I really found was Was in the X direction, and this five meters per second, I'm assuming is also in the X direction. Most important reason being that, what I gave you up here was the We really found here wasn't the impulse from just our face, but the impulse from the person's face and the force of gravityĭuring this time period? And the answer is no, not Now, aren't there otherįorces on this ball? Isn't there a force of gravity? And if there is, doesn't that mean what But what this question was asking for was the impulse from a single force. In other words, the impulseįrom all forces on the ball. In momentum of the ball, and when we do that, what we're finding is the What we really did was we found the change Now, if you've been paying attention, you might be like, wait a minute, hold on. That's why this impulse hasĪ positive direction to it. The impulse on this person'sįace is to the left, but the impulse on theīall is to the right, because the ball was initially going left and it had a force on it to the right that made it recoil andīounce back to the right. So, which way did our faceĮxert a force on the ball? Our face exerted a force Impulse, which is a vector, is the same direction as Kilogram meters per second, and that's gonna give me positive three kilogram meters per second is the impulse, and that should make sense. I multiply this all out? I'm gonna get zero, no, sorry, I'm gonna get one kilogram And, if you didn't plug that in, you'd get a different answer, so you gotta be careful. This leftward initial velocity, has to be negative 10. To have two different sides, so this has to be a negativeġ0 meters per second, if I'm assuming rightward is positive. But this ball changed directions, so the two velocities here have People just plug in positiveġ0, then get the wrong answer. Vector, it has direction, so you have to be careful This is 10 meters per second to the left, and momentum is a My final velocity is five, because the ball recoiled to What's my final momentum? My final momentum is M times V, so it's gonna be mass times V final, minus mass times V initial, and my mass is. So, we know that the change in momentum is gonna be P final, the final momentum, minus the initial momentum. The change in momentum 'cause I know the velocities.
![impulsive force model worksheet 1 answers impulsive force model worksheet 1 answers](https://s1.studyres.com/store/data/010188234_1-05b69300279b7d77d6e9e57e3452626e-300x300.png)
We don't know it yet, but I can figure out So if you need a way, a pneumonicĭevice, to remember this, Jape Fat is a way to remember how impulse, change in momentum, force, and time, are all related. So, if you look at this, it looks like J-A-P, this This is hard for people to remember, sometimes my students like And since it's the net impulse, and this formula appears also true, this is equivalent, which is saying that it's the net force, multiplied by the time duration, during which that net force is acting. So if we can figure out theĬhange in momentum of this ball, we can figure out the The change in momentum of that object, like the change in momentum of this ball. On an object, like this ball, that should just equal If you're talking about the net impulse, in other words, the impulse from all forces
![impulsive force model worksheet 1 answers impulsive force model worksheet 1 answers](https://s3.studylib.net/store/data/007527194_2-18e0cf5dd92d1ba2fb4f7ec13ca76577-300x300.png)
But, there's an alternateįormula for impulse. Is exerting on the ball, so I can't use this formula
![impulsive force model worksheet 1 answers impulsive force model worksheet 1 answers](https://www.coursehero.com/thumb/d7/19/d719e6d7f48fbbf76d0aea3994b323a541636771_180.jpg)
I don't know the force that this person's face So, if we knew the force on this ball, we could use this formula Is equal to that force, multiplied by how long thatįorce was acting on the object. In other words, the impulse, from a force, So the jimpulse, or the impulse, is defined to be the forceĪcting on the object, multiplied by the time duration during which that force is acting. I end up calling it jimpulse, just so I can remember that it's impulse, and there's a J for it. The ball from the person? Now, the definition of impulse, we use the letter J for impulse, that always seemed a little weird to me. So, knowing this information, we can ask all kinds of questions. Kind of compressed and then recoils and expands again, let's say the time that it's actually in contact is about. It comes in with 10, leaves with five, and let's say that time, time right here, the time period that it's actually in contact with the person's face, let's say the time, when the ball is getting So it's probably gonna recoil with a little less speed In at 10 meters per second and let's say it leaves at a speed of five meters per second. Let's say the ball comes in at a speed of about 10 meters per second. Scientifically speaking, to talk about the impulse, momentum, force, time relationship, so let's do that. And although, unfortunate for this person, it's a wonderful opportunity, This may or may not have happened to you. This person right here is about to play dodgeball.