Conservation of Energy - Physics 101 / AP Physics 1 Review with Dianna Cowern

Lesson 10 (Conservation of Energy) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!

Exercises in this video:
1. You compress a spring by 0.2 cm. You measure a restorative force of 0.55N. What is the spring constant of that spring?

2. A scary amusement park shoots you and your friend 80 meters into the air. The total mass of the people and car in the ride is 400 kg. What work was done by gravity on the trip up? How much potential energy is now stored in the gravitational field?

3. All of that energy (in the previous problem) came from around 700 springs, in parallel, each compressed by 1.25 meters. What is the spring constant of each of those springs?

4. Can you use conservation of energy arguments to show that Dianna is wrong, and the back of the roller coaster is by far the best place to sit?

Special thanks to Sophia Chen for her awesome shoutout at the end of the video!

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Rachel Watson - Video Editor
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

[backpocket]

Wish you were my science teacher when I was in school. A teacher like you makes someone think about science every day for everything.

[NewMessage]

The spring in a bow is not the string... it's the limbs. The string does not stretch, and would make the bow much less efficient if it did.

[twothreebravo]

The one thing I have learned through all of these 10 lessons is that you need a slightly bigger table.

[ken.waters]

For a second there I was wondering why Dianna was waving her shoe around.

[aimen]

im a big fan and wish to become a physicist im currently in high school waiting to do my gcses I want to let u know you've inspired me to take this path and want to say thank you <3

[Bladesmith]

Psychics is so much more understandable when presented by an extremely charismatic person. My high school physics teacher could put a cup of coffee to sleep in 5 mins flat. Thank you Diana for communicating science.

[jaimes]

it's incredible that you're doing these lessons!

[Szymmon]

I learn so much from this videos! But not about physics itself, but about differences in notation across the world. And it's also interesting.

[arthurschwieger]

Both. In the front, you go over the top of the first hill first and you kind of hang there as the rest of the cars finish going up the hill. At some point you start to get pushed down after that great pause. If you are in the back, the opposite happens. You are going up the hill and as you are reaching the top, you start to accelerate and get whipped over the top of the first hill. So sitting in the front or the back both have fun factor written all over them.

[anshusainiaiims]

Thanks mam you are great who giving amazing lessons for just got medical college and I my little sister also want to....so I give advice to her to watch your

Please mam continue this till last and teach all highschool physics

Lots of Love from India ♥️♥️♥️♥️

[davidfrischknecht]

Regarding roller coasters; the best place to sit depends on the reason you're riding the coaster. If it's airtime you're after, it's usually the front. However, if it's speed and an out-of-control ride you're after, the back is usually the best.

[augustinesim]

Hi Diana! I'd like to make a suggestion for the next videos: could you rise the volume of the sound recorded? There are certain parts of the video that are barely audible and I have to increase the volume on the computer but even then it's still not good enough or it's too loud.
Another alternative/solution would be adding subtitles, they help a lot too!
Nice video!

[mattomon]

Dianna you need a bigger table!
i love your teaching style.

[rmsgrey]

For a roller-coaster, you don't just transition between up/down slopes and flat sections - you also get 'u's where a downslope becomes an upslope with less flat than the length of the train. In those sections, it's the middle of the train that is moving fastest at the bottom, not either end (though at peaks the middle moves slowest, which is more boring when you're going over a hill, but more exciting when you're doing a loop)

[ankitaverma]

I only used to memorise physics until now so I know like all the formulae and maths involved but your videos really helped me to visualise physics like never before.
Thank you so much Diana❤️❤️

[RAHULSINGH-okxe]

Best video on conservation of energy with thrilling examples. I enjoyed this video lot..
Thanks for such awesome vedio 🤩🤩🙏🙏🙏

[Samjain]

As always great content thanks Dianna on Archimedes principle

[collincourtois]

Imagine having a physics teacher like Diana... I'd go back to school in a flash!. Thank you.

[kdaddy]

First, most theme parks will be nice to let you wait to go in your preferred row. Lastly, the back row is best on typical lift-hill coasters since the front seaters have to wait for the back seaters to reach the top. On launch coasters, the front seat is best.

[alexs_toy_barn]

i graduated from college with two engineering degrees last year and i just recently passed the FE exam a few days ago. i know everything about all this physics stuff on this channel i just discovered, but i like it anyway since it's so familiar