Newton's Second Law of Motion: F = ma

One of the best things about Newton was the way that he showed how natural phenomena abide by rigid mathematical principles. So much so that we can use mathematical equations to calculate how objects will actually behave. This equation, F = ma, looks pretty tame, but it packs a punch!

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[kabbilar]

I didn't want to study this shyt when I was in college and now I'm a drop-out. Now I'm interested in this thing. Love this life ☺️

[michaelspurlock]

F = m a
m = F / a

The units for force is the Newton which is also expressed as Kg meter / s2
∴
m = (20 Kg meter / s2) / a

The final velocity is 2.3 m/s

The acceleration means change in velocity:
a = (2.3 meter / s) / 3 s
∴
a ≅ 0.77 meter / s2

For each second that goes by, velocity increased by about 0.77 meter / s

m ≅ (20 Kg meter / s2) / 0.77 meter / s2

m ≅ 26 Kg

[rudyh.]

my teacher complicated this but you just showed me that it’s easy, give her teaching lessons please x

[ohdeardeer]

I wish his solving would be more detailed, it'd help a lot. I do appreciate the style of his videos, but this one specifically kinda felt hard to follow. No hate though, just constructive criticism! I adore his work.

[datboifloyd]

Connecting:
What do I already know about the topic? What are three big questions I think will be answered?
• It is a major part of physics, motion, and science. 1. How is this related to Newton’s first law?
2.What the law is?
3. Why this is important to physics?

Processing:
Important ideas, events or actions
(you may use pictures, words, icons)
F[







Transforming/Personalizing:
What are the three most important things to know about Newton’s 2nd Law? How do I know? (Explain why this is more important than any of the other things you know about Newton’s 2nd Law) What is an image or symbol that represents this?

[snehaldas]

Hi Prof! My teacher said that the more correct version of the second law is F = (dp)/(dt) * k ..where p is momentum ofc..and the statement of the equation as per my teacher goes-- the force applied on a body is directly proportional to the rate of change of momentum. Well, of the three laws, I find the second one trickiest of the lot, so I could really use some detailing on this if you may. Thanks for all your in a nutshell videos!

[inadaizz]

Now I remember why I don't enjoy learning physics.
I enjoy knowing and understanding physics but learning it is painful.

[lipikakankaria]

this guy deserves way more subscribers .

[LindaCarlesi]

Dear Professor Dave,
We are writing on the behalf of our 6th grade class and we just wanted to let you know that we are watching your videos on Newton's Laws of Motion and we are really enjoying them. We were wondering if you could do a zoom session with us and answer some of our classes questions.

Sincerely,
Linda Carlesi from the Stevens Cooperative School

[samaiatraforti]

You're a wizard. Thankyou for your ongoing magical content, stepping in where my lecturers don't

[yarasaeed]

as an Egyptian girl I really really like your video...you're intelligent Dave!♥

[wyskun]

I have a very important 2 questions for me:)

1. In space, there is a space shuttle that does't move. Mass of this shuttle is always constant. This space shuttle has a rocket engine which produce a constant force of 100N. When the engine is started and the ship has a constant thrust of 100N, when the ship starts to accelerate, will the acceleration be constant and remain constant (let's assume 10m / s), or maybe the acceleration will start to decrease as the speed increases? It is related to the rule Ek = 1 / 2mv ^ 2 ???

2. Same space shuttle doesnt move. Shuttle start to accelerate from 0km/h to 10km/h in 5 seconds and it takes "X" energy for example. How much energy it will needed to accelerate also 10km/h more in also in 5 seconds when it allready have velocity of 100km/h ? Also "X" energy? Or much more "X" of energy? And why is that?

[TheKids]

Dave should be rewarded the best professor in existence!

[akrutimishra]

he explains every thing so easily . great explanation

[trunghungpham]

Wait, ... so F=ma. If I jump off a tall building from the attic, then F=mg with m is constant and g is constant so F is constant. That means there’s no difference between jumping off from 2nd floor and 20th floor.

[asmamehran]

F=ma

F=20 N
m=?
a=v-u/t

To find acceleration
v=2.3 m/s
u=0
t=3 s

a=(2.3-0)/3
a=2.3/3

Now,
F=20 N
m=?
a=2.3/3 m/s²

F=ma
20 N=m × 2.3/3 m/s²
20 N × 3/2.3 m/s² = m
60/2.3 kg = m
26 kg = m

[MrDiamondGeeza]

Wow, this took me 2 days to understand, and you explained it with in 4mins bravo thanks

[chimisteimane]

first of all thanks a lot for everything Professor
secondly, can you present to us a video about "fluidization " ? please

[jayjayme]

I wanna be Professor Dave in Halloween. He's LYFE. <3

[ScilexGuitar]

Best explanations on youtube :) You´ve helped me a lot in organic chemistry especially :) THank you so much