Circular Motion

[OtterPad]

Cheers

[rafwarrior]

i know this is off topic but i think dat indy car racing is crap

[moyaish]

lol



[jennyandemily1]

gr8 video much better then my teacher :)

[hickup7]

thank youuuuu!!!

[mikewu610]

@hickup7 you are very welcome! :)

[mabalag]

Ecellent, the best aspect of this video is its conceptual strength. I am a physicist and Engeneering Doctor teaching by 20 years and, belive me, this is the best I have seen.

[mikewu610]

@mabalag Wow, thank you!!! It's an honour to receive such a compliment from you.

[r1ckyla]

thought centripetal force was imaginary

[nanone1994]

Oh thank you guys ! finely i get it many thanks for u this is amazing ! :D

I never though i will say this but PHYSICS IS SO MUCH FUN ! :D xD

<3 <3

[Zayin1993]

well you did something right... you got classes watching your video!

[abe235]

this only on uniform circluar motion where the speeding up

[jk3053]

Mrs. Luster Rocks (my wohoh)

[modykingmido]

whats that sport called the one with the spinning ball?

[mikewu610]

@modykingmido I believe it's called hammer throw.

[masterchief377]

@modykingmido IT's called "shot put"

[mikewu610]

@masterchief377 shot put is pushing the ball with hand, without the wire. the sport shown in the video is hammer throw.

[loik345]

love this video. keep up the good work

[monterey194]

so the centripetal force is the tension on the string or the friction of the tyres on the track+gravity, but whats the centrfugal force that stops it from moving towards the centre of the circle?

[mikewu610]

@monterey194 By Newton's First Law of Motion, objects tend to travel in straight lines, and in these examples, the magnitude of the centripetal force, which is determined by the mass, angular velocity, and radius, is not enough to bring the object to the center.

[Yabaser1992]

@monterey194 according to Newton's third law to every action force(CENTRIPETAL FORCE) there is an equal and opposite reaction(CENTRIFUGAL FORCE)

So centrifugal force is the reaction force to centripetal force that stops it from moving towards centre

[gazh92]

class watched tis physics class haha

[mikewu610]

@gazh92 cool

[g76smith]

Hi Mike - thanks for the really nice video - most of it is fantastic, but as a physics teacher, I wanted to offer two small points that would help it be perfect.

In the case of the car turning, the inward turning force comes from two places: a little slice of gravity, due to the banked track, and friction. On a banked track, the gravity slice is mgsin(Q), where Q is the track angle. Friction plays a much bigger role, and is umgcos(Q), where u = coefficient of friction. Keep up the good work! GS

[mikewu610]

Yes. Thank you for the advice. That would make it more accurate! :)

[Krazed2Kraze]

Thanks for the vid (: Also, rocky music ftw XD

[hacksign000]

thank you so much, that was very simple and easy to understand <3

[abignerdynerd]

where did u find the animation... the one explaining direction of velocity and centripetal acceleration with ur head in the middle?

[mikewu610]

that I made it myself =) a little flash animation

[abignerdynerd]

@mikewu610

lol, nice

[zyy1993]

yo mike

my turn to do it now

mr marr

hehe

[mikewu610]

Haha, Good Luck!!!

[MattyTeare]

GRAVITY IS NOT A FORCE! Gravitational field strength is though.

[MsDdurey]

Look again at the racing car travelling around a corner. The force of gravity acting on the car is at 90 degrees to the (shortest) line that joins the car to the axis of rotation and so cannot play a part in providing the centripetal force. A major contribution to the centripetal force is that due to the friction force between the tyres and the track - but friction doesnt get a mention.

[mikewu610]

gravity doesn't contribute to the centripetal force, but the normal force does. since the race car is traveling on a sloping surface instead of a flat surface, the normal force, i think, plays a bigger role than the friction.

[ppamik]

thanks so much! :D

[GulliBertus]

blaue hose, du opfer

[ZeroMinima]

Very good video, but i wished there was more footage of people with green trousers!!!111einseins

[deeb1978]

Excellent, well done!

[Yager007]

awesome!

[quickgonzalez89]

good footage!

not very educational though

[circle559]

good video,, great and also educational and fun to watch.. very creative..

[victortang5]

so nice!

[victortang5]

so nice!

[jrendoso]

Man, thanks it makes physics fun and easier, very helpful keep on it

[brilliantfranz]

Amaizing vid, truly amazing

Thanks for uploading, keep on.

Greetings from venezuela

[toasterder]

Eh, how did you derive v^2/r? its kinda bad to throw ppl in the lurch over there if you don't teach them differentiation wrt angular velocity...

[julzbruhl]

Amazing. I have to do build a rollercoaster using the laws of physics, this vedeo was extremely helpfull!!

[dudemello2]

great video! will use it to teach my students!!

[lolface524]

nice dude

that was really helpful!