More on Newton's second law | Physics | Khan Academy

In this video David explains how to use Newton's second law when dealing with multiple forces, forces in two dimensions, and diagonal forces.

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

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[marinamedinaa]

Physics is really hard for me but the vectors surprisingly make sense to me. So this broken down really helps. Thank you!

[xannianangel]

i started understanding it but when he started discussing the Pythagorean theorem i was like "david mah boi, slow down"

[atkiiaa]

Idkw I found this dude very formally humorous like I just laughed so hard when he said 'you can't just simply, NAIVELY add expect to get the right answer' lol

[Lands]

I appreciate the breakdown of the Law and how to apply it. However, it is not beneficial to students new to the application of the concept if you say "you could then solve this" without providing the answer. That is part of the reason why people are coming to Khan Academy. So they can receive instruction that is better than their teachers at school. However, I feel this teaching style is exactly the same as at school. The only benefit is that you can pause and rewind.
I just wish I could pause, solve it myself, and then play the video to verify my answer. Instead, I pause, solve, and the question is changed and my answer is no longer valid. Doesn't help practicing the basics if I don't know if my answer is right...
Not that I don't appreciate the help in understanding the topic. I love these videos. Please keep them coming! Just a little frustrating to have little to no practice of concepts. Just lecture on theory.

[simranjoharle]

gave me a new view to look at the second a lot!

[abhishekpandey]

Love your voice dude.... Really..an attractive voice :)

[supb]

I wish he solved the individual equations first BEFORE throwing a new Force into the problem just so I could correct my answers. Made everything confusing.

[tabarakaljemelawy]

I actually learn everything and they make it so much easier than the teachers that I have. <With ALL do of RESPECT!>

[hayleygibbs]

Awesome! This is the first video where I've heard your voice I think :)

[sparshgupta]

I’ve watched some of your lectures, why don’t you guys make an app and probably a website for this ??

[dlu]

We can use our knowledge of 30-60-90 triangles for the horizontal F_7 vector.

[c.u.z.o.n.e]

Please the same way you put the vertical acceleration and horizontal acceleration into PYTHAGORAS to find the total acceleration can't you do the same with the forces

[Thumb_Spirit]

Seriously, is that's how you teach simple by just complicating the stuffs as much as possible.

[iconic]

The asteroid ends up having an acceleration of 5.71 m/s2 at an angle of 132.94degrees off the x-axis

[vvvcc]

Can't we just create a new sum of forces for the force at an angle?

[WhiteFontStudios]

And it turns out you cannot do that lol 6:29

[ShivaniSingh-rfdv]

It's good that you're trying to explain that in real life vectors act on an object from different directions, rather than horizontally etc. However, because you keep adding vector after vector without solving each example, the end answer is wrong. For instance, acceleration from +25 - 40 +50 -30 should be 5, not 10 however because it was not solved in the first place, 10 got plugged in another example which makes that answer wrong. So overall this video provides clear explanations of how to calculate the acceleration when vectors act on an object from different directions, but because vectors keep getting added to explain this concept, the page becomes messy and the end answer isn't right.

[thanaa]

This is the creepiest comments section for a video i've ever seen

[zayadalsalman]

you made it very hard to me there is a different way to solve this problem not only in this way:( you were using a lot of numbers in this example and that is wrong because how can I release what is the forces if I just see this law for the first time in my hole life :(

[hell]

what is vector force I didn't understand it properly