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ESPN-Relaxing with Impulse video

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ESPN video: Relaxing with impulse showing the key ideas for impulse and momentum. Watch the video and answer the questions.

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you can find a sports figures website by logging on to go Network go.com a man what's a secret relax how could you relax that's the secret show me you relax Right Way X reader Lac relaxed sports figures put your brain in the game I think I just kick that ball where did something way cooler than that I changed the balls moment sitting here on the TV no it has momentum it's moving and has mass and velocity so how do I change a Snowman hey something's momentum we have to add a force you might think that's a kick but it's not it's really an impulse in physics we describe the force that changes something's momentum with the word impulse right do something on the spur of the moment without giving it much thought like when you buy all the stuff next to the cash register that's called impulse buy I love these so impulse has to do with time physics into a force that happens over a finite. Of time is what makes a force and impulse how long the force act can you take a lot of hard it's definitely on the game the game bases mean bone in your body but we had pads on Willem de and spending a lot of time in the offseason getting physically fit and getting prepared for the pounding they were about to take during the year I think it's weird right how could relaxing when you're about to get tackled help it did ask me if I were going to hit by Derrick Thomas I don't want to tense up my muscles when I got tackled so why relax guess who we like your body bands when it gets hit so it doesn't hurt as much what is the word for this. on the concrete down below but what if I were to jump from up here land in the what we know that the watermelon had no meds and when we dropped it and we know that both watermelons have the same momentum because they had to stay mad stand there drop him exactly the same height why did one watermelon splash where do you buy pink the reason I can jump from way up there and put in the water is because water is softer than concrete for not trying to write what the reason it really works is time when the watermelon hit the concrete and had lots of moments after it hit the concrete its momentum with z it stopped its momentum was affected by a force the resistance love the concrete when the watermelon hit the water and have the same amount of momentum zero it stopped its momentum affected by an outside force the resistance of water the change in momentum was exactly the same because of that we can say that both watermelons were affected by a force and forces change momentum forces affecting the Watermelons a little differently the difference was that it took longer for the watermelon to stop in the water right so we can just look at the presence of we have to look at for some time and it pulling force and time are in full correct the difference is how long it took for the momentum to change and the time it takes for a forced to change something's momentum is an Impulse right remember when we said when a force changes something's momentum over a finite period of time it's an impulse moment what are the things we know about momentum is that it has both magnitude and direction to a change in direction is a change in momentum to sports figures Blackboard an Impulse doesn't necessarily have to stop a player like a tackle Optimus me running back bounce off another player changing his Direction that's an Impulse to hear we see Kaufman take shot but it doesn't stop and what it does is changes direction if his direction is changed you know his momentum is change that's an Impulse at work right there what this means is that we can figure out impulse in more than one dimension bye bye. Of time they can stop you or change your direction but it's always an Impulse I'm or cologne for the sports figures Blackboard spot the force was greater because of the time was so small the difference in time is watermelon or downward moment the same thing happens when we give momentum to an object when we kick a football riding a lot of force over a short period of time that's an Impulse but what happened over longer time go to like the concrete but what's the same as the water equation for impulse force times time equals the change in momentum we get the change in momentum buy some can the momentum after the impulse from the momentum before the impulse zero because it's not moving what are kickers open in momentum of kilos to meters per second semester change in momentum using high-speed photography we can find how long Veronica's foot was in contact with the ball about 8 1089 Shopper app we just divide the momentum by the time to get a force of 750 Newtons happens if we change the balls momentum with a C over a different time again the ball starts with the momentum of zero and when Muhammad throws it the ball has the same velocity and obviously the same man gives it the same momentum 6 cubic meters per second but the big difference is this when we figure out the time for half a second we solve for f again and you Cam Newton support Buffalo that was way different wasn't even close I mean your forces a whopping 750 but you applied a little forth over a longer period of time and you gave a lot of force or a short period of time to get the same results there's lots of ways to get an impulsive 6 kilos meters per second of course in a short time or a small force in a long time I always tell you to go through when you hit the ball because the longer you make contact with them the biggest that brings us to football pads shoulder pads these are hip pads and bees bypass all phone and phone is all about time what are the same football pads do is increase the impact time when you get hit the phone compresses and that takes time just like the water horses left because it changes your momentum more slowly look at the way in the airbag Works what the airbag does is that time to the impact more time left for the principle of force times time equals change in momentum is around as everyday is he what a shock absorber really does is extending Sports so now we know why you're supposed to relax when you get hit now hold up your head and relaxing okay why they didn't hurt at all these now when you get hit in your body relax your body gives way with the hit right and the more time it takes to change the momentum the less the force right haven't you ever heard the expression roll with the punches the second has a big effect on Force yeah when can hit by Derrick Thomas you take all you can get okay guys so what are we impulse of the forest for a finite period of time in the time now change the time is the port very cool tightening up your muscles when you get tackled the way to go relaxing is really the key I told you I'd like to thank the bullying coffin and the Oakland Raiders I got momentum Marquez Muhammad mr. Steve level of the Oakland Police Department for helping us out today on ESPN sports figures relaxing with him you can have this back then thanks for watch yo it's over we'd like to thank all the sports figures who participated in today's show free of charge ESPN sports figures is presented commercial free for educators to use in the classroom call ESPN Bates 6058 2004 accessing on the web at ESPN that's not Sports dumb.com see you in your class have a question you'd like to see explored on sports figures Bristol Connecticut for the email address on your screen ESPN sports figures with your brain in the guest

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