Question

Help? Is the force of the earth’s gravity on the sun stronger, weaker, or the same as the force of the sun’s gravity on the earth? Explain why the sun’s attraction affects the motion of the earth more than the earth’s attraction affects the sun’s motion. Employ Newton’s second and third laws in your answer.

Answer 1

This is a beautiful question to check whether you have really understood the second and the third law

lets start with third law, what does third law say?

Answer 2

For every action, there is an equal and opposite reaction

Answer 3

and by action .. what exactly do we mean here?!

Answer 4

force?

Answer 5

good.. these laws are universal.. and they have no exceptions what so ever..
so whenever one object puts a force (action), on some other object, that other object WILLL ALWAYS ALWAYS ALWAYS ALWAYS ALWAYYYYYYYSSSSSSSSSSSSSSSSSSSSSSS put a force of THE SAME MAGNITUDE.. on the first object and EXACTLY IN THE OPPOSITE DIRECTION (reaction)

AT THE VERY SAME TIME.. so you can call anyone action and reaction.. ALWAYS ALWAYS.. and this can be ANY KIND OF FORCE.. doesn't matter what kind it is..

ok.. so now.. tell me what do you think about the first question of ur post?

Answer 6

So the forces of gravity on each other are the same based on newton's third law?

Answer 7

are u asking me? :O.. u know newtons third law

i WANT YOU TO SHOUT THE ANSWER WITH ALL YOUR MIGHT AND ENERGY.. i want you to tell me the answer for 100 percent.. SO TELL ME WHATS YOUR ANSWER?

Answer 8

THE FORCE OF EARTH'S GRAVITY ON THE SUN IS THE SAME AS THE FORCE OF SUNS GRAVITY ON THE EARTH BASED ON NEWTON'S THIRD LAW.

Answer 9

good job .. !!:D

Answer 10

so from now on.. u don't need anyone's permission to come at such conclusions.. do you? :D

ok.. next question.. try and think of that

Answer 11

haha I know, but I wanted to make sure it was right

ok I don't know the answer to this one. I think it has something to do with the mass of the sun being a lot bigger than earth's

Answer 12

lets try to see if that's right now

lets say you kick a foot ball.. with all ur might.. and u put a whopping 100Ns of force on it.. and the ball flys off.. now i want you to answer my question

does the ball put a force on you? how much force does the ball put on you? and finally tell me why don't you go flying off?

Answer 13

andi want you to be quick.. cause its almost mashy's bed time!

Answer 14

hmm the ball puts a little bit of force on you, but hardly nothing. and go flying off what?

Answer 15

how much force? what you think?

a) more than 100?
b) less than 100?

Answer 16

less than 100

Answer 17

if u were in front of me.. i would spank you. until ur butt got red :X


SCROLL UP AND SEE WHAT NEWTON'S THIRD LAW IS!!

Answer 18

oh crap so more than 100 because I'm putting 100N's of force into it

Answer 19

no that's wrong too.. :-/
the law says every action has a.. EQUUUUUALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL and opposite reaction!

so tell me again... how much force does the ball put on your leg, when u kick it?

Answer 20

100N? there wasn't that choice on a) and b) haha

Answer 21

so?..

didn't i tell you.. u have to be 100 % sure ? if i ask you whats your name.. and don't include ur name in the option? does that change the answer?


ok.. now tell me this.. the ball puts 100 N of force on you too.. and u put 100 N on the ball

but the ball goes flying.. and yet u remain there? why is that?

Answer 22

because my mass is so much greater than the ball's? So that means that the answer is that the sun's mass is a lot greater than the earth's

Answer 23

thats right..
and what mathetmatical relation just explains what you just said?

Answer 24

newtons second law: Fnet = m * a

Answer 25

good boy

now comes my bonus question

there is a net force on you (100N ).. so although your mass is HUGEEEE .. (hahah ) .. still u should have gotten a tinnni winniee acceleration..
why didn't you get that?

Answer 26

oh god I have no clue. it's probably obvious haha

Answer 27

not obvious..

think about it.. there must be some other force acting on you.. making sure that total force on you is zero
which force could that be?

Answer 28

i really don't know mashy, maybe friction or something

Answer 29

friction it is.. this is everyday physics.. you should think about these stuff.. thats what will make u learn more.. :) :) :)

if u were on ice skates .. or maybe roller blades.. and u took a huge boulder and threw it.. believe me.. u would race backwards.. cause the friction would be really small!..

Answer 30

anyways.. the take away is.. the earth DOES accelerate the sun.. but the effect is so small.. it hardly makes it wobble!. .

Answer 31

Thank you! I liked how you explained the process instead of just giving a straight answer

Answer 32

your most welcome!! .. have a good day! :)!

Answer 33

THREE CHEERS FOR MASHY!