Viewing a single comment thread. View all comments

ExtonGuy t1_isjzraz wrote

Reply to comment by Grombrindal18 in Do 2 objects on opposite "ends" of the universe pull on each other to some extremely minute degree? by Courcy6185

M87 is pulling on you exactly as much as you pull on M87. The forces are equal and opposite, at about 1 x 10^(-24) N. Which is super small.

EDIT: if there were no other forces involved (like Earth's gravity), that much force would move you about 0.1 micrometers in 100 years. For comparison, a red blood cell is 7 micrometers diameter.

24

wanted_to_upvote t1_iskc92s wrote

I think what he means is that he will move towards the black hole as opposed to the other way around (in relation to other objects) as the orbit decays.

2

FatiTankEris t1_iskgas5 wrote

The force then is still equal. People forget that acceleration depends on mass too, and that's why people fall towards Earth more than Earth falls towards people.

13

GarunixReborn t1_isl6dvp wrote

>M87 is pulling on you exactly as much as you pull on M87. The forces are equal and opposite

no, M87's gravity is much much stronger than that of a single human. They are anything but equal.

−5

ExtonGuy t1_islave3 wrote

The forces are equal. The responses to the forces are unequal.

3

GarunixReborn t1_islz49p wrote

So why do you fall faster on earth than you would on the moon or mars? Do they themselves accelerate at 6m/s towards you?

1

ExtonGuy t1_isnzn9h wrote

You fall faster on Earth because the force is 6 times more than on the Moon. They don't accelerate at 6 m/s^(2), because even thought they feel the same force you do, they are many billion of times more massive.

Acceleration = Force / Mass

On Earth, your acceleration is 9.81 m/s^(2). Earth's acceleration toward you is 8.21 x 10^(-23) m/s^(2).

0

GarunixReborn t1_ispnp90 wrote

>You fall faster on Earth because the force is 6 times more than on the Moon.

So the forces are not equal then

1

ExtonGuy t1_ispy79c wrote

The force of the MOON on you is not equal to the force of the EARTH on you, that much is true. But the force of the moon on you is equal to the force of you on the moon. For any two bodies X and Y, the gravitation force of X on Y is equal to the force of Y on X.

0