Conservation of Energy: Free Fall, Springs, and Pendulums

The energy of a closed system is always conserved. This is an important law of physics! But energy does change forms. What are all the forms, how do they interchange, and how does this apply to things like free fall and pendulums? You gotta watch this clip to find out, buddy!

Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!

[nicolejaja]

I have a hard time understanding physics when there's no too much theory, but your videos are the only ones who make me understand 100% everything in physics. I want to say that thanks to your videos I got the best score in physics of 100%

[philipestrin]

For the past five decades, having flunked out of premed (remember, this was the '60s) I have still yearned to truly understand physics, chemistry, et al., simply for the sheer pleasure of understanding how the Universe works, what it is made of and its history. I've tried periodically many times over the years to initiate this understanding, since I have a large quantity of science textbooks I've purchased over the years (some applying calculus and some not). I start out full of resolve and optimism, I solve some of the problems. But soon enough I'm not able to solve them anymore and my energy (I'm using the term strictly in its colloquial metaphoric sense-- I understand its definition in physics) flags and I give up. I was always left with a feeling of frustration, because the yearning remained, despite the futility. Then, I discovered your tutorials and now I'm finally grokking (again with the '60s) these concepts and solving the problems. .And, at 75 years old, just in time. Grazia tanto, Signor Professore!

[pantheon.gamers]

I wish all classes and lectures were just like this. Straight to the point and effecient

[kf]

I love how simple and easy you make these concepts seem, my tutors over complicate EVERYTHING and their lectures leave me more confused than before I started! A class mate recommended your videos over the lectures and I'm so glad they did because I'm now understanding things in 5 minutes that before would of taken me weeks of sifting through my tutors overcomplicated jargon to reach the same understanding. I wish all professors were as clear cut and concise as you, keep up the good work educating the masses, love your content!

[CODMReaper]

Thank you so much, I have been trying to figure this out for 2 days. The teachers lecture is very unhelpful in using the formula even though he took 2-3 hours to explain it, the textbook literally has only solutions for F=kx which made it impossible to even use the textbook. I can't believe how hard it was to even find a proper explanation on google, finding your videos is a godsend. I can finally answer the 4 questions the teacher has posted. I really really like physics and the idea but good explanations are so far and few.

[FinleyPS]

So grateful that these videos exist! Unfortunately, professors can have a great understanding of physics but little ability to pass that understanding on. You, however, do have that ability!

[matiassolomon]

i can't express how satisfying it is to try to solve the problem at the end of the video and then get it right first try.
thanks prof dave!

[ygreaterr]

4:25 my heart is beating. im waiting for this moment! "did I calculate right?", "am i a loser?"! this is the most interesting moment

[lesliesamonte]

thanks Prof. Dave! This helped sooo much!!! All the love from the Philippines!

[natashad]

eljko Milković, an academic and inventor from Novi Sad, has done something great that has not been done by any Serbian inventor before.

Milković invention of the mechanical oscillator is widely used worldwide, a testament to the fact that over 500 foreign companies use, sell and manufacture pendulum-based machines used in the heavy industry.

The purpose of the two-stage meganic oscillator is multifaceted, because the character of the machine (two-arm lever with pendulum) allows its use as a press, water pumps, compressor, crusher, power generator, mini power plants.

[kelvinthehuman]

Excelente, excelente, excelente, profesor Dave. ¡Saludos desde la República Dominicana!

[rashmikanojiya]

sir ur physics videos are absolutely clear with the concepts ..thus help students to understand them easily

[jenniferbello-ldrp]

How can you find the maximum height of an object? I'm learning this unit in class and it was really confusing but your video explained it really well.

[avegarohanjaiswal]

hey its me again
love your simplicity !!

[moric]

you can also get the answer of the last question by using
v^2 = v0^2 + 2as formula

[arctic]

Professor, I had a question. If you would answer this, I will be very grateful.The question is:
An object is in free fall when the force acting on it is exclusively gravitational. But why then the moon is in free fall? Isn't there centrifugal force acting on it?
Thanks professor.
Lots of love.

[modojijindabad]

Nice lecture sir... Love from India ....🇮🇳🇮🇳🇮🇳

[bluey_fan]

Dang who else teacher told us to watch this video to compete the assignment

[xqzyt]

So, which is correct? GPE > KE + SE + HE, or GPE > KE > SE + HE ?

[thegrayside]

when can i use g or -g? does velocity a vector?