Impulse and Momentum

[@leonardodavinci4978]

legit watching this 10 mins before my exam

[@briannapulido4152]

PLEASE SAME

[@briannapulido4152]

@Cale Reiter ok and😩🙌🏼

[@jevenpaulchan2367]

same

[@leonardodavinci4978]

@Ori Bandel just received my report card. believe it or not, i got an A in physics

[@leonardodavinci4978]

@Ori Bandel thanks! I'd also like to thank professor Dave

[@szilike_10]

This was an exceptional video, so big thanks for that. I've studied physics for a good time in highschool, and I thought I was really good at it. Until I got to a CS college and started to study calculus and how it is related to mechanics. Then things got a bit messy and now I am recovering the stuff I thought was self-explanatory at first. I think it was the video I needed to clarify the confusedness in my head. Keep up the great work!

[@redsurfer_255]

I mean u were actually bad at studies 😂

[@szilike_10]

@@redsurfer_255 No, I don't think so. I think my professors weren't that great though. It's different when you learn only formulas with little explanation and learning where they come from.

[@Sai-ns2sk]

Where are you nowwwk

[@sasukesan96]

I felt so happy that I got it right after struggling for a few minutes, I have no idea why I always decide to procrastinate when it is actually pretty cool and fun to be doing physics

[@enchiladas3003]

I'm still procrastinating...

[@chendusingh]

@@enchiladas3003 My life in 3 words

[@lgaz4614]

@@chendusingh not just you lol

[@ytuser4562]

The same guy 3 hours later, deep in theoretical concepts like dark matter and string theory and entropy: *physics sucks*

[@andyrendon7753]

taking intro to physics and it is so interesting how we can use it in every day life. I am a biology major and have always wondered when we would use physics and its helped me learn how a centrifuge works or even how the bicep compensates force holding weight and the forearm. Everything really does link up.

[@julieace7777]

I'm an engineering student currently taking mechanics and our prof just shove us with formulas to use. It's great to watch videos like these that actually give definitions. Thanks!

[@alili945]

isn't this high school physics?

[@majafrostad5733]

@@alili945 high school physics are often mostly mechanics, which is also often the first class you have to take for an engineering degree (at least where I live). So there is a lot of overlap

[@sadiaaa1373]

​@alili945 as a first year in uni taking an advanced physics course, this was legit useful to me. Idec if it's hs physics or not I learned a lot from this. Im learning relativity, time dilation and length contractions.... and then introductory impulse lmao 😭

[@swagodaman6320]

@@sadiaaa1373 Even a professor can return to relearn and refresh on simpler topics, there is no need to be ashamed of learning. The only shame is remaining ignorant!

[@kyaa7934]

this was extremely helpful .. i have a physics test after tmrw and the teacher sucks at explaining

[@grylltheonion]

@Kabita Karan Why do are teachers such so much...

[@scienceblossom6197]

As someone whose mother tongue is not English, this sentence by professor Dave really helped me a lot when I was trying to understand the everyday meaning of the word "momentum" : "The more momentum the ball gathers, the more difficult it will be to bring it to a stop." In my language we say "دوربرداشتن" :)

[@exothermic4549]

Amm, ok what about the diff btw the impulse and the momentum? it’s not really clear

[@carultch]

@@exothermic4549 Impulse is the cause, momentum is the effect. The net impulse acting upon a body equals its change in momentum. Impulse is the time-integral of a force. Net impulse is the time-integral of the net force. Look up what integration means as a Calculus term. The short answer is that it is a multiplication of force and very small time intervals, added up throughout the time interval. Momentum is what a body possesses in motion, which is a product of its inertia and velocity, that is used for keeping track of Newton's third law as a conservation of momentum law.

[@johnxina5126]

That's Farsi?

[@scienceblossom6197]

@@johnxina5126 Yes, exactly.

[@mcneelynorman1]

Great video. I am a physics teacher and I've been looking for ways to get the info across in a better way and I think this video has given me some great ideas.

[@julielemus55]

You inspired me to study science prof d!

[@demoosaad8579]

1:29 cheers, this car braking sound scared the heck out of me. I thought there was a car crashing straight into me.

[@ashermak]

the physics Jesus that we didnt know we needed 🙏

[@bluskyebasta4801]

Dave the way how you explains physics is absolutely great! Tks to you I'm able to attend all my exams... thank you very much!!!

[@ghostek7792]

dood ily, i have massive add and i generally can gain a great understanding of concepts but i really lack the ability to grind studies for practice. it's crucial that before doing that i have some overall conceptual understanding and purpose of something before filling in details and your videos are BY FAR the best for this type of learning. they're just detailed enough to be relevant and don't overly simplify topics and i love that

[@nxstalgia547]

If Dave is your first name, is Explains your last name???

[@ProfessorDaveExplains]

nope, just the dave part!

[@edgelordofmordor]

You clearly don't listen to foo fighters do you? Cuz if u did, you would have known that he is Dave grohl, their frontman

[@edgelordofmordor]

Professor Dave Explains I'm just joking sir, it's just that you look just like Dave Grohl.

[@marjgiangan1221]

why did you just subtact the initial and final velocity? it is supposed to be multiplied to mass

[@mohnazaidi4666]

@@marjgiangan1221 You can common factor the mass out, making the calculation easier for yourself (smaller numbers to subtract, and only one multiplication instead of two). 50x + 50y = 50 (x + y). Hope this helps~!

[@mirastudillo1178]

OMG THANK U!!! You literally just resumed in 5 minutes what I’ve been trying to learn and understand in 2 months! You saved my life!!!!!

[@kingofbirds]

this comment section is golden, very good dramatic readings

[@nightowl104]

at 3:26 aren't you contradicting what you said few seconds ago........first you said if time of impact is large force will be small...than you said if ball is in contact for as long as it can than force will be maximum???? its confusing plz explain this

[@derar5555]

any explanation ?

[@taymshadi6794]

He said the momentum will be larger for the ball and it makes sense from the formula as when you increase time the momentum increases

[@kajalarora1348]

This is better than many other videos i saw on impulse momentum equation.....

[@beastmastergaming8039]

What happens if no impulse is done to an object what happens to its momentum? I need help.

[@diyachudasama8317]

No impulse Means F is 0 so the change in velocity (Acceleration) is also 0 beacuse of constant velocity (Ist Law of motion)

[@bvolpato]

Thank you, Dave! Your videos are helping me a lot.

[@ayushkumar_ohkkgod5375]

Sir really your voice is very clear. Because it is difficult for many people. ♥️♥️♥️♥️♥️♥️♥️♥️♥️❤♥️♥️♥️♥️

[@justsomebody6440]

in these five english lesson minutes i understood more then in 100 russian(my native laguage) minutes of school. Thanks Dave!

[@humaidalkaabi8541]

We need more examples for each equation

[@Muwahid999]

@JOSHUA SAMUEL we love jesus pbuh and all other prophets too

[@papaisduniyakapapa]

@JOSHUA SAMUEL I Ain't Converting

[@vijayaprakashullattuthodi2804]

Ya exactly

[@vijayaprakashullattuthodi2804]

Add more examples in this veido

[@jackwilson4324]

@@papaisduniyakapapa The only thing you'll be converting with this channel will be units of measurement, in some physics problems

[@shivapawar6441]

0:09 I like this part of intro 😂😂😂

[@skeeterburke]

i was just looking at some chemistry stuff, you learn something new every day! reactivity series of metals pnemonic device "please stop calling me a careless zebra, instead try learning how copper saves gold"

[@aprilchen192]

I had a student who told me you look like Jesus!

[@monkstiny.1070]

No one knows what jesus looks like

[@hunainqazi7576]

Jesus! did u see him?

[@sanskarpatel3171]

Jesus of physics

[@mcgraidymacatangay1701]

@Ramez Jamal Can u not be such a killjoy u religous dweeb

[@PK-qs5xw]

@Ramez Jamal nah fuck jesus fake son of a bitch

[@anantkrishna6280]

Best invested 5 mins of my day.😀❤️

[@lojspodkrinko7386]

Im sitting an exam about this tomorrow and I get this in my recommended, like a gift from a god

[@twiggy333]

This was a very detailed video, especially regarding the relationship between impulse and momentum. In such a short time too! Nice Job Dave

[@gabbbbbbb_433]

Thank you for teaching me about momentum and the different it makes between smaller and larger objects

[@brittany871]

Im kind of confused..@2:49 you mention that the force will be large if the contact is instantaneous and much less if the impact has some time duration but then at 3:26 you say that the maximum possible force will be imparted if the contact between bat and ball are large. Please help during 'your spare time'. Thanks for the videos! FE exam on the horizon and this is closing the gaps.

[@maximusthegreatest]

Ya didn't get this either

[@DanTGOD]

Thanks a lot, professor!

[@anupreetham6151]

This is so helpful !! Thanks professor Dave and keep doing more n more videos . 😀

[@phiavecc6487]

ily professor dave you have saved my physics grade

[@piyushchoudhary6414]

Literally help ful.....thanxxxxxx

[@AfterODDs]

i understand now why most lecturer refer to ur video ❤ really good stuff

[@smat3542]

thanks professor Dave.

[@ptkoms]

Dave - Your video's rock!!!! Keep up the great work!!!

[@poisedperson6475]

Very well explained video. My friend happened to give me a physics textbook I could try for fun (from like year 3 or something) and it's on special relativity. I don't have the prereqs to take physics as a degree at my university, and I want to see if I end up liking this kind of stuff, and this well-made video helped me understand it, and I got the question at the end right (1.4 seconds). Thank you, professor Dave, and keep telling off these dumb flat earthers! :)

[@dakotamercer1679]

At 3:35 when he talks about hitting a ball with a bat; if (assuming Force is constant) F= change in p/change in T; wouldn't a shorter contact time result in a larger force being applied to the ball. A bigger contact time would result in a larger denominator and thus a smaller force no? The previous example of someone falling off the trampoline seems to follow the idea I just described. If the contact time is larger, a smaller force is applied. What am I not understanding here?

[@ProfessorDaveExplains]

So with the examples of someone falling, there is a fixed change in momentum that must occur. He goes from falling to motionless, because he hits the ground. That fixed change in momentum is equal to F delta T, so if delta is very tiny, F must be very big, like just smacking the ground. If delta is very big, F will be very small, a small force applied over a longer time interval. That's different from the baseball, where a constant force can be applied over some time interval, and the change in momentum generated is proportional to the time interval in which contact is maintained.

[@dakotamercer1679]

@@ProfessorDaveExplains Thankyou for the reply! So just to clarify, for the trampoline example, there is a set change in momentum (falling to resting); but in the baseball example, the change in momentum (impulse) can be increased by the constant force that is applied the longer the bat is in contact with the ball.

[@ProfessorDaveExplains]

yep that's it!

[@UnclePythagoras]

good stuff I like your way of explaining physics with real practical instances prof

[@JArtfulLiving]

Simple, clear and accurate explanation makes learning Physics easier.

[@hlali021]

Watching this a week before my test, wish me luck guys!

[@katihoffmann8]

Thanks for saving my life multiple times now!!

[@KOKIwriter]

you explain better than any Book or College Professor

[@jingyiwang5113]

You explains impulse and momentum in a really clear way. Thank you so much! I understand this point now. 😀I benefit a lot from watching your tutorials both when preparing for exams and self-studying topics of my own interests.

[@Octoberman07]

YOUR EVERY INTRO. IS VERY FUNNY BUT AMAZING WITH BEAUTIFUL SONG.🥰🥰🥰

[@ilmareofthemaiar]

At 3:27, shouldn't he say the change in momentum of the ball will increase by increasing the contact time (instead of the force) cuz it's the same force being applied, just over a longer time?

[@ProfessorDaveExplains]

hmm, watching back that's more or less what i said, no?

[@amrithvincent8530]

get absolutely obliterated by the physics master himself

[@thevinugunawardena9188]

I have an issue regarding the bat and the ball. If the change in momentum Is delivered in a short period of time increases the force. Shoudn't having more contact reduce the force imparted??

[@adriantee5219]

Your arm is still applying a force. Thus, if the same force is applied for a longer period of time, the change in momentum will be greater. Since the mass of the ball is constant, that means the velocity of the ball will increase more. Hope that helps!

[@thevinugunawardena9188]

Thx man 👌

[@eun6354]

my brain is not braining

[@douglashagan65]

You know what a genius is someone who can look at a tennis player from a distance until just how good he is in a half an hour

[@meng425]

my dumb ass at 3am who thought this was a meme video bc the formula on the thumbnail literally said “fat p”:

[@k-osmonaut8807]

*B R U H*

[@harizahmad9489]

1:29 Chill Professor Dave, that gave me a mini heart attack

[@GutsyStudyGirl]

Thank you!! This video helped me to understand the concept of momentum much better than before - I especially appreciate the good illustrations! :-) And ofc the quick question at the end to test our understanding. Thank you!

[@ShaziaArsalan]

You are a physics teacher by true means

[@cringiestthingever9317]

Professor Dave is singlehandedly carrying me through my first year of engineering college

[@jacksoncamania6064]

Thank you very much, Prof Dave. Highly appreciated. ❤

[@aqalwaly3364]

u r the beast professor ever thanks a lot

[@neonboy1998]

Yeah he is a total beast😂

[@studybuddy6034]

have you lost your mind!!!!!!?????

[@Fcab1234]

I have an exam of o level and this helped a ton

[@lukem3724]

Prof. Dave seriously be the man, bro. Da Man!

[@BappleBusiness]

YOU ACTUALLY SAVED ME THANK YOU

[@TurtleyTortoga]

Thank you man you’re knowledge just saved me

[@dinometeourblast4223]

flawless linking of concepts as usual. Thanks very much

[@disha2936]

Wow nice explanation ❤❤ watching from india

[@kachuzgee5581]

For the swinging the bat to hit a ball example, I am confused. Wouldn't this cause a lesser impact and thus a smaller force if contact between the bat and the ball is maintained for a longer time period? How does more momentum impart onto the ball?

[@fatdogonsand]

THE BRAKES IN THE MIDDLE OF THE VIDEO JUMPSCARED ME

[@cockroach7237]

The the initial mass of a body is = m1 The mass of the body changes to m2 At time t (the change occurs suddenly, as if m1 - m2 Was dropped on m1 at t ) V2 = m1V1 / m2 According to conservation of Linear momentum m1V1 = m2V2 But according to conservation of kinetic energy ½ m1V^21=½ m2V^22 V2 = V1_/m2 / m2 But velocity cannot be different.. So is one of the principals not applicable in here?

[@mrbojanglesmj8457]

I love DAVE. DAVE is life. DAVE is love. DAVE is Happiness. DAVE is my favorite UwU

[@palotello273]

real fav UwU ever

[@ishaved2265]

Salute those who are here before a day of exam and still seeing comment box insted of study 😂

[@marioleung3935]

thank ya 4 savin' igcse student from heck!

[@its_wills_world]

This explanation is way easier to listen than my teacher’s.

[@GryffieTube]

Engineering student here, very well explained, thank you.

[@ba6722]

Shoutout to 9C. Great video, very cool!

[@brycegabriellui]

Yoo #9C is life

[@GGs-c1u]

I'm not even in school but this is still fun to watch :D

[@skunko1871]

2:21 FAt

[@marvinpamulaklakin8609]

hello professor, how did you get =1.4s?

[@wangyibo8055]

Thank you for your video! It helped me get full points on my test! Keep up the good work :)

[@thegodofthegods1084]

A car crumples for this exact reason so that the impulse can be smaller and we take on less force as occupants of the vehicle. Basically the longer the crash lasts and slows down the less force we would experience. Similar to how if we jump off a ledge and hit the ground, we bend our legs to slow down, if we jumped and kept our legs straight out knees would probably be injured.

[@thefiugitod1037]

Dave i have been enjoying the course. But i have an important questions as for the last couple of tutorials about work and types of energy i have been struggling a little bit with comprehension. For example in this tutorials comprehension was both the sides divided by -200? Is it done algebraicly ? And should i learn algebra to be able to solve efficiency and how far should i study in algebra to solve physics problems? Is calculus needed to solve physics problems? Please can some answer this questions. It will be really helpfull.

[@simonhaukongo4013]

This was very helpful....! You the man🤩🤩

[@pravisrambaran6550]

Thank you Prof... but a would like to know about the momentum, impulse regarding to coefficient of friction... can you you please help or suggest me a video

[@ProfessorDaveExplains]

check my classical physics playlist it has everything you need

[@briannaworthley8801]

cramming for the ap physics exam in 2 hours thank you so much

[@CarmensProjects]

so how'd you do?

[@jeghetersoojeong]

Oh my god i am studying physics just by my self and I just got so thrilled when I got the answer of the quiz right.......

[@ashishkumarsharma1323]

lmao

[@syednaqvi7905]

relateable

[@dariokawaski]

Thank you professor Dave 😊

[@JaffreyH]

If you have a force sensor, which is at the end of a track, where an object of mass m slides down, and compare it to an ideal spring replaced in the same spot, would there be any change in impulse if you repeated it? Im so confused, thanks for your help!

[@briankibet9387]

Thank you, the concept is well explained

[@MARZ_1425]

10 minutes after watching this could give me the information that I couldn't get from my instructor!

[@xand3r..645]

This really helped me, thanks Dave! I will ask my teacher to show this in class!

[@Waxonly]

You always make things easy for me thanks prof🙏

[@jacobarras2102]

Oh my god, I was listening with headphones and I thought my roommate just got murdered at 1:29,😂💀💀💀

[@rzenty]

I solved many problems like this. This one is better for understanding the theory!

[@MrDoomtoon]

Why the intro is so addictive, Its also nostalgic I don' know why

[@shakeelamlay130]

Great content. It's a life saver when I'm studying for exams

[@camacoyote8357]

Ok so dew to gravit can an object falling that’s small have the same impact force as a large bolder of it hit you

[@anonymousjc3]

The ball of mass 0.16kg is shot towards the goal, but hits the goalkeeper’s leg guards instead. The ball has an initial velocity of 30ms^-1 and the time of the impact is 0.02s. It rebounds with a velocity of 10ms^-1. Calculate the average force of the impact. Can someone help me out? I don’t know whether this is equal to -320 or 160N because I’m a little unsure of whether the final velocity is -10ms as it’s rebounding but yeah. It equals 160N when v = 10ms and -320N when v = -10ms

[@AhmedGamal-jz3bd]

Hello sir , Please i have a misunderstanding,in the example of baseball why do players increase time of contact while you had said in the preceding example of falling of the roof “ if impact is instantaneous more force would impart to the body”

[@ProfessorDaveExplains]

so it's not a precisely analogous situation, there is a fixed amount of force that can be imparted onto your body by falling, and elongating the contact time will diffuse that force over that time period and make it less impactful. but with a baseball swing, you are continuing to impart force for every instant that the bat touches the ball because you are continuing the swinging motion, so more contact time means more force is imparted.

[@abhinav5077]

Angular momentum please?

[@ProfessorDaveExplains]

some angular motion stuff is coming soon!

[@ahnafredowan4853]

Thank you very much. I was tearing my hair about what is impulse of force

[@krispy0w0]

you are a life saver. Jesus of physics

[@shickmcgary4436]

Thank you for the breakdown it was very insightful and helped a lot!!

[@TheJabberJ]

Sorry just wondering, don’t you need to convert the kg to Newton first to be able to calculate the equation for your practice question at the end?

[@carultch]

No, because we use mass in the formula for momentum, rather than weight. The equations you combine are: delta p=m*(v2 - v1) I = delta p =F*t Solve for t: m*(v2 - v1) = F*t t = m*(v2 - v1)/F You are given v2, v1 in units of m/s, and m in kg. You are given F in units of Newtons. You have kg-m/s in the numerator and N (which is kg-m/s^2) in the denominator. All units except the second instance of seconds in the denominator's denominator will cancel, and you end up with seconds as the final unit.

[@nabajyotidas3116]

In 4:05 you said that momentum has been transferred, but what momentum actually means nobody knows. If you can then please make a video on it I.e what momentum is in reality instead of just expressing it as m times v. I request you to make a video on it please.

[@ProfessorDaveExplains]

That is indeed what momentum is. It's literally the definition of momentum.

[@nabajyotidas3116]

@@ProfessorDaveExplains isn't momentum the property that keep a moving object moving. While searching a lot on net I found a webpage where an example was written that.... Suppose a ball is being thrown towards you at a velocity of 30km/s of weight 'a' then when you catch it you feel the momentum which has been transferred into u. Sir, is momentum really something like this?i'll be indebted to you forever if you spare some time and clear the doubt that I've regarding momentum.

[@stuartgray5877]

@@nabajyotidas3116 Another way to imagine it: You are on a frictionless ice-rink, stuck in the middle. You can choose two devices to get off the ice. Either a shoulder fired crossbow that fires a 10 kg projectile at 10 meters per second. Or a canon you can sit on that fires a 1 kg projectile at 95 meters per second. assuming the crossbow and canon have the same "rest mass", which one could get you off of the ice quicker?

[@nabajyotidas3116]

@@stuartgray5877 thanks a lot dude. Actually through all this you're asking me to feel momentum through conservation of momentum. But it's a good way. Thanks bro. Luv u from india!

[@stuartgray5877]

@@nabajyotidas3116 - Good! Now what is your answer? Which one of those devices can get you off of the ice faster?