GCSE Physics - Momentum Part 2 of 2 - Changes in Momentum #60

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Did you pass? How'd they go?

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Heyyyy update us!!! What were ur results!?

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@@maryamzia28 hey guys! i passed with 5A*s and 2 As!!! can you believe i got an A* in physics? xD im so grateful! thanks for asking and thank you @cognito for being such a wonderful teacher, i got accepted into pharmacy in the top uni in my country and im in my second year :)

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@@dropyourcroissant830 Great to heat that!! You absolutely rock! I'm so happy for you. I've got my IGCSe Examination in a few months. Wish me luck!!

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@@dropyourcroissant830physics is so hard for me, pls pls tell me how u got A* in it

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Since this is the last Cognito video I'll ever watch (I have my last two GCSEs tomorrow, physics and geography) I just wanted to say thank you for making such great videos. You've been so great since I made a note of the channel of a video my Year 9 chemistry teacher showed us over two years ago and I honestly don't think I'd be able to cram as well as I have been without these videos to watch. You explain everything so well without over-complicating it and I love the animations, especially the nerve cells in the biology videos. Thank you so much

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how did it go?

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@@h8iraithese bots don’t respond

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Hi, sorry guys haven't been on this channel in almost a year, happened to be recommending these videos to Year 11s and felt like checking. Got my 9 and now almost finished AS-Level physics (not as scary as it sounds). Good luck to any current Year 11s! Remember, GCSEs aren't as bad as they feel, I hope you all get through it :)

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for yall 00:05 Forces can change an object's momentum 00:52 Force required for change in momentum 01:37 Calculating force using change in momentum and time 02:20 Calculating force required to accelerate an object using momentum equation. 03:12 Calculation of final momentum and force using equation 04:05 A sudden decrease in momentum can cause severe injuries 04:48 Safety features in car design 05:30 Objects lose momentum more slowly because they're compressible.

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I have my olevel gcse exams from the 25 of April too I hope yours go well too also how many are u giving

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If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform - cognitoedu.org/coursesubtopic/p2-gcse-aqa-h-t_3.12. The platform’s totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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Hi Q, that’s a very good question, and the answer is both yes and no. ‘Yes’ because if you remember and *understand* all the information in these videos, you’ll be able to apply the knowledge and work out the answers to the toughest exam questions (and obviously answer the simpler ones). ‘No’ because we don’t cover practicals at the moment, and you’ll need to score highly in those to get a top grade, and also because the hardest exam questions will ask you to generalise principles you’ve learnt to completely new situations. We do our best to help show you how to think through difficult questions, but ultimately, it depends on the individual whether they draw the right connections between different concepts on the day, to get those top marks :) Good luck with all your work 🙌

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Q _TheFun practicing past papers helps tons !!

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Cognito Thanks for the explanation, i’ve been wondering about this for a while

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Hi, thank you very much for these videos. It helped me a lot. I know you're uploading GCSE maths videos right now but after you're finished can you start A-level physics et cetera?

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Hi Mai_Ya, glad you're enjoying them, we can't promise anything but we are hoping to start A-Level science after these maths videos 👍

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[@user-ox5qs1he1o]

I had a question if we stop a cycle or any moving object what will be the formula? Will it be mv-mu/t.? In our textbook formula for this case is mu- mv/ t. As the final velocity is 0.

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[@shradha-xp8mi]

Isnt ρ, rho used for density and small letter p used to represent momentum?

[@unfortunatemystery1778]

Derivation of the formula Of force F=ma As a = (v-u/t) F= m(v-u)/t M(v-u) is change in momentum

[@taniodusina4389]

how do you know to use this formula. we could have used F = m times a

[@kamilakurbanova2156]

Do I need to know how to calculate the change in momentum for the AQA combined science syllabus?

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[@InxenXionalliving]

Hi, i have a question... in the first example the mass is not considered when calculating the net force...was that a mistake or am i missing something?

[@aboodtube3969]

i think im pretty late but heres what i think. the formula he is using requires momentum, but not mass. we do need to know the mass to find the momentum tho, so if you already know the momentum then you dont need to know the mass but if you dont know the momentum then you do need it

[@laethferas4214]

@@aboodtube3969 *im pretty late*

[@philipbrady9358]

excellent

[@jinethweragama1218]

for the change in momentum question, cant you work out the change in velocity over time(acceleration)and the use F=ma to find the force applied??

[@sellosenekane9750]

That formula is derived from that one

[@sellosenekane9750]

So yes it can be used

[@sellosenekane9750]

So yes it can be used

[@gaiacooper5]

Isn't F=(mv-mu)/t the same as the v-u/t equation?

[@neldino1251]

no because the second equation is to do with acceleration rather than change in momentum momentum has mass involved as well

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@@neldino1251ah, thanks.

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this is great and all but i just realised how many huns I fumbled. it’s bad😅

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4:30

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Exam should cancel