# AP Physics 1: 1.3 Fields in Space

THE EARTH'S MASS IS ABOUT TO DOUBLE. Sorry for the extreme tone; we just want to make sure you understand the...gravity of the situation.

 AP Physics 1 Fields in Space Language English Language Science Practice 3 Engaging in scientific questioning

### Transcript

00:26

well if mass doubles then gravity must double too, right? well then we'd be

00:32

correct yes and the correct answer is option C but there's math that supports

00:36

our brilliant intuition here so let's check it out gravity equals the [Floating mathematical equations]

00:40

gravitational constant multiplied by mass divided by the square of the radius

00:44

of the sphere in this equation the gravitational constant is represented by

00:48

a big G if we double the mass then we'll have 2m rather than just m and when

00:55

we distribute the 2 we get this so we don't need to worry about plugging in

01:00

the actual numbers for now as long as we understand how the map actually works [A plug going into a socket]

01:03

another way to look at it well force equals mass times acceleration right

01:07

double the mass you get double the force and that's how we can prove that our

01:11

initial thought is in fact correct the good news about a planet twice the size [Planet Earth doubling in size]

01:15

well math is still math the bad news yep we'd weigh twice as much and we've heard

01:21

about the freshman 15 but oh this is ridiculous... Heyy!