Who here knows about Sir Issac Newton??? Quick, I need it for tommorow at school!!!

[urbantechie]

Are all these three quotes about gravity?

First law-
A body continues in a state of rest or to move with a steady velocity in a straight line if it is not acted upon by forces.

Second Law-
When a force acts on body it produces an acceleration that is proportional to the magnitude of the force.

Third Law-
For every action there is an equal and opposite reaction

 

[Killbat]

No, well the first two kind of. Gravity is a force like any other force.

 

[urbantechie]

Then wtf are those laws saying?

The third is saying reaction = Opposite Reaction.

Up = Down

Right?

 

[FrogDog]

Those are Newton's laws of motion...I don't think they have much to do with gravity.

Edit - They're saying that Force = Mass X Acceleration

 

[konichiwa]

1. An object at rest will stay at rest and an object in motion will stay in motion at a constant velocity and on a straight line unless acted upon by an unbalanced force.

2. The acceleration of an object depends on the mass of the object and the amount of force applied.

3. You got it.

 

[Killbat]

They're general laws. The forces and objects could be anything.

 

[glenn1]

i was not a science major, but i think those were his "laws of motion," and although they could relate to gravity, aren't about gravity per se

 

[urbantechie]

Hmm, so which should I apply to my Gravity Presentation?

Every body persists in a state of rest or of uniform motion in a straight line
unless it is compelled to change that state by forces impressed on it.

Equals

What goes up must go down.

right?

 

[Feisters]

Newtonian Law has nothing to do with gravity. He used gravity to prove his theories, but they work without the benefit of gravity. It's all about mass and motion.

 

[konichiwa]

I think they're called the laws of gravity because, according to myth, he thought of them when an apple fell on his head...gravity pulled the apple down, etc.

 

[FrogDog]

<< Every body persists in a state of rest or of uniform motion in a straight line equals what goes up must come down right? >>


Yeah, without gravity things would not come down. Which is because of the force gravity exerts on an object and accelerates it downward at 9.8m/s^2.

 

[Killbat]

Clarity on the third law: equal and opposite reaction is more like: aircraft thrust air backwards to push them forwards.

 

[FrogDog]

That's conservation of momentum though.

 

[urbantechie]

So which should I use!! I'm confused!! I like the last one and the first.

 

[Killbat]

So far as I can tell, there is no connection between gravity and the third law. Your best bet is the first, and the second is also related.

 

[FrogDog]

No the third doesn't pertain to gravity I don't think. The first does some what.

Edit - Killbat beat me.

 

[urbantechie]

Ok, this is what I wrote for the first law.


What is gravity?
Newton?s 1st Law: Every body persists in a state of rest or of uniform motion in a straight line unless it is compelled to change that state by forces impressed on it.

In English: Without gravity, if you were shot by a canon, you would fly in the air forever until you hit a wall.

 

[urbantechie]

SCORE AND JACKPOT!!!!

Check out these two links!!!

http://www.leohome.com/GravityDemo/NewtonLaws1.html
http://www.leohome.com/GravityDemo/NewtonLaws2.html

 

[urbantechie]

How do I explain the second law in english?

If another force interupts on the first force, the oposite is created?

 

[urbantechie]

Help me!

 

[urbantechie]

PLEASE!! I beg of you!!!

 

[Triumph]

what's so hard about the second law? F=ma. it takes a force to make something change it's state. the first law tells you this. the second law gives you a quantitative value associated with that force, i.e. a number. that's all there is to it.

 

[urbantechie]

<< what's so hard about the second law? F=ma. it takes a force to make something change it's state. the first law tells you this. the second law gives you a quantitative value associated with that force, i.e. a number. that's all there is to it. >>




What????

 

[konichiwa]

Force = Mass * Acceleration

The more mass, the more force, the more acceleration, the more force. And vice versa.

 

[Mday]

yeah, gravity is not exclusive to any of those laws, nor are any of those laws exlusive to gravity.