Velocity and Speed are Different: Example Problem

[@eoo37]

You always fix my Mistaken concepts. That's why I keep watching your videos.

[@FlippingPhysics]

I look forward to the day when you tell me you caught the mistake before I told you what it was in the video.

[@eoo37]

Flipping Physics I hope so😂

[@oyska_g2985]

"You are in my basement..."

[@FlippingPhysics]

Dhriti Sharma. Nope. The total distance traveled, as measured by the phone app, is 1.2 km. "travel a distance of 1.2 km and return to his house" means he travels a total distance of 1.2 km and ends back where he started, at his house. It does _not_ mean he traveled 1.2 km away from his house, turns around again and travels another 1.2 km. Admittedly, I probably could have added the word "total" to "travel a 'total' distance of 1.2 km" to make it a bit clearer, however, I feel the map shown during the video makes it quite clear.

[@parthpagar6644]

ohhhhh

[@Liebe_Zoldyck]

It's kinda easy if you are the teacher. Thanks for the effort you did making your videos.

[@bennyko2178]

This channel is def gonna help me with college calc based physics :)

[@aneeshmathur969]

This man hasn't gotten an oscar nomination yet?!?!

[@divyanshloshali1371]

thanks sir this help me lot . I like your teaching style

[@elderboy8959]

Wait. I have a question? : Is Velocity the average 'speed' of whole journey with direction and Is speed the speed 'during' the journey?

[@FlippingPhysics]

No. Velocity is defined in terms of displacement. Speed is defined in terms of distance traveled. Displacement and distance traveled are two very different things so Velocity and Speed are two very different things.

[@elderboy8959]

Oooo. Thank you Mr.P

[@carultch]

@@elderboy8959 The distinction is the adjectives "instantaneous" and "average" as they apply to concepts such as speed and velocity. An instantaneous rate means we focus on one snapshot in time and answer the question of how fast the quantity is changing. In the case of velocity, instantaneous velocity is the rate of change in position in an infinitesimal amount of time. In the case of speed, instantaneous speed is the magnitude of instantaneous velocity. Average of speed and velocity means we study the cumulative change in position over a finite time interval. Average speed considers the total distance travelled and the time interval. Average velocity considers the start and end positions independently of the path, and the time interval. Average speed depends on path, average velocity does not. Another way to think about this. Suppose you are on a 45 mph speed limit road, and a cop pulls you over claiming that you were speeding at 60 mph. You then say, "well that's impossible, there aren't even 60 miles between here and my house, and I've only been driving for 15 minutes". The cop doesn't care how long you've been driving or how far you went. It is your instantaneous speed that the police radar picks up.

[@fallenarchangel4133]

Pure lore: these kids were kidnapped.

[@camilamendes5902]

Great !!

[@FlippingPhysics]

Thanks!

[@maxislas3141]

Hello Ms. Lieu's class!

[@yatisoni5382]

Why we calculate speed with direction is velocity but we know that the speed is distance by time and the velocity is displasment by time so speed with direction as velocity but it's distance not displacement so what's is reason. please solve my। Please......🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@aji5016]

Uhm. I'm a tad bit confused, but I think the answer you're looking for is the fact that (Delta x) the total change in position/displacement is equivalent to the difference between final position and beginning position. If you start and end at the same position, there is no displacement. 1.2 - 1.2 = 0(Or .6 - .6 = 0 if you want to autofix grammatical issues with the word problem). So it can't be equivalent to speed. Speed only requests the total distance traveled

[@dhritisharma4208]

Ummm... isnt the distance 2.4 Km... I mean... travel a distance of 1.2 Km and return to his house...

[@_BhagavadGita]

Exactly.

[@harshini5845]

Thought the distance would be 2400 m since they come back to the house

[@OkOk-hi7ih]

instantaneous speed is instantaneous velocity without direction i think you are using the word 'speed' as average speed and 'velocity' as average velocity. my book treats speed and velocity unqualified as the instantaneous.

[@FlippingPhysics]

+Ok Ok "instantaneous speed is instantaneous velocity without direction" is correct. What I refer to in this video are specifically "average speed" and "average velocity". At this point in my video lectures, I haven't defined "instantaneous" yet. I do a bit later in this video: www.flippingphysics.com/instantaneous-and-average-velocity.html

[@jacksonrapp3818]

Whats Up Kolls class

[@eggsamillion]

I vow to discover where you live, fine sir.

[@FlippingPhysics]

Best of luck to you...