Time, patience, and love. Thanks for caring!

Exactly! Your videos deserves so much more. They're best on KZfaq for high school physics

Wow. That is some very high praise. Thank you very, very much!

This makes me 😃

Thanks!

You are very welcome. I am sorry about your teacher's handwriting; that must be difficult.

It makes me very happy to know I can help you learn physics. Best of luck to you in your studies!

@@FlippingPhysics Thnx Sir

I was intrigued with this video's plot, seeing his three alter ego students being self-motivated to come up with their own calculation to explore his demonstration.

Why yes, it does!

You are very, very welcome!!

Thank you very much!

I do still teach high school physics, however, I teach part-time in order to have the time to make these videos. Glad you enjoy them!

Flipping Physics I’m glad you have the time to make these videos because they allow me to pass making a C to an A

Congrats on improving your grade! You must be proud of your hard work to do so.

It's the chord known as C-suspended-4th, with the music notes C, F, and G (Do, Fa, & So). Middle C is very close to 256 Hz, and the corresponding F and G in the same octave on the same scale, would be 342 Hz and 384 Hz respectively. It is very common for a 1:1.5 music note interval, like that of C and G, to form a chord, the interval known as a perfect fifth, because of how well the waveforms fit together. Actual middle C is a little higher than 256 Hz, because A is used as the note that is specified as a rational number of Hertz (440 Hz).

Thanks. I love this video. I've got to get back to doing more videos like this one.

Thanks. I am quite proud of this video. Enjoy learning physics!

Thanks. When making the video I also discovered that my key fob is also slightly directional. When you get to the edge of the distance where it works, try turning the key fob and see if that makes a difference as well.

Glad it was helpful! That is a screen recording of Adobe Audition.

Thanks for the kudos!

I guess it is me who should say "Thank you" for such amazing videos. Nevertheless, you are welcome and, of course, thank you!

Consider the basic equation of motion for simple harmonic motion of a mass on a spring. m*a = -k*x Which can be rearranged for: m*a + k*x = 0 Replace a with d^2 x/dt^2, to make the simplest second order differential equation you'll solve: m*d^2 x/dt^2 + k*x = 0 This is the equation that governs its natural vibration motion, if you start it at an initial displacement x0, and initial velocity v0, and then let it vibrate freely. The solution will take the form of x(t) = A*sin(w*t + phi), where w=sqrt(k/m) which determines the frequency, and A and phi are constants that you can calculate from initial conditions x0 and v0. This is how it will move as a function of time from the initial conditions onward. Now, what if, instead of just giving it an initial condition when it starts vibrating, we apply a forcing function that continues throughout its motion? This is what resonance is. The response of a system that vibrates, to a stimulus from the outside environment at its natural frequency. Suppose we apply a forcing function given by F(t) = B*sin(c*t), where B and c are constants. This could represent a vibration taking place on a moving floor, responding to a background sound, or a human hand shaking it. Maybe the mass is a car, and the spring is the suspension, and the forcing function is a bumpy road the wheels experience. Now the equation of motion is: m*d^2 x/dt^2 + k*x = B*sin(c*t) When c=w, you end up with a particularly interesting result to this equation. The amplitude of the sine wave solution will continuously grow as a function of time. This is resonance.