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a very essential question

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dear all,
I was thinking about the formula F=ma and I don't understand it please help me please!
 

Newton's law states that the rate of change of momentum of a body is equivalent to the net force applied to it. We know that momentum = m*v, so the force will be F= d(m*v)/dt. For most cases, the mass is costant, leading to the famous F=ma.
 

anamakachamanene said:
I still don't understand :(

easiyl : if you want to accelerate and object than you have to apply force to it.

So it s proportional with its mass. it means F=ma

Also accelaration(a) causes speeding up(higher velocity ) v=at (if initial velocity =0) that means depending on time and accelaration your velocity ll be up or down(including negative accelaration)

exp: if you want to make a car go faster than you have to speed up(giving force)
after accelaration ends(a=0) that means you r giving no force(F) depending on mass you have to give more force (F=ma)

so cool:D
 

anamakachamanene said:
I'm confused. what is momentum here then? is F power? please help.

other definition of force((instant momentum) as described earlier F= d(m*v)/dt)

Assume a hammer moving 1m/sec and 1000 grams when it hits an object it exert a force to object. that means ,t exerts m*v(force to object) and object starts to move (F=ma) if object is 1000 grams than it ll have accelaration of 1 m/sec². Off course time of applied force causes the final velocity. (V=at). we say that momentum is intantious (MassHammer*VelocityHammer=MassObject*VelocityObject) here you can use momentum when you dont know exact force applied.(using velocity and mass)

But as i understood you dont need momentum. So forget about it and think about what i wrote before..
:D
 

Ok. try another way:

acceleration =d(V)/d(t) (means that changes on velocity over time )
F=ma-----> m*d(v)/d(t) (mass * accelaration) from here we say that

F=m*V/d(t) (bold section = momentum. Also d(v)/d(t)=a ) so in other word Force means instant momentum

Theese are just definitions;

So lets go back to F=ma just you asked;

From the formula F=ma if there is any a(a<>0) then F<>0 ok.
that means if F<> 0 and mass isnt changing then a<> 0.. if a<> 0 then from d(V)/d(t) <>0.. it means V is changing by time. and finaly if there is a force that means (F<>0) there should be accelaration(a<> 0) and accelaration means changin velocity.
 

anamakachamanene said:
what is d(V)/d(t)? what do you mean by a<>0? what is <>?

d(V)/d(t) derivative of velocity over time (Slope of velocity over time)
<> smaller or greater
 

voltage?!! what is voltage?! is it something like momentum? you didn't say anything about voltage in other posts :(
 

anamakachamanene said:
voltage?!! what is voltage?! is it something like momentum? you didn't say anything about voltage in other posts :(

Sorry i changed. it should be Velocity.
 

What is difference between velocity and acceleration and momentum? :( and what was voltage? :(
 

anamakachamanene said:
What is difference between velocity and acceleration and momentum? :( and what was voltage? :(

simply : at start you have 0 m/sec velocity. after time passes(1 sec) if you have a velocity of 10 m/sec than the acceleration of you is 10/1=10

that s all
 

what is m/sec?!!! oh my god! there's lot to learn! voltage, velocity, acceleration, momentum, even m/sec?!!!!
 

Forget abou tvoltage . it was mistake.

m/sec----> meter / second------> its a unit of velocity. and this topic should end here. Come back again when you have enough knowledge
 

Dear zirtapoz,

I am a telecommunications engineer! It was just a survey to see how tolerant some people can be, and boy! you are tolerant!!! you could be good teacher. :D so tell me now, what is voltage?!!!!!! :))))
 

anamakachamanene said:
Dear zirtapoz,

I am a telecommunications engineer! It was just a survey to see how tolerant some people can be, and boy! you are tolerant!!! you could be good teacher. :D so tell me now, what is voltage?!!!!!! :))))

i was answering another forum, and yours. and both have been mixed velocity became voltage voltage became velocity... :D
 

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