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Fields in Space Videos 15 videos

AP Physics 1: 1.1 Fields in Space
195 Views

We've heard of some crazy dieting fads, but leaving the planet may take the cake. We don't suggest you do that, but we do suggest you answer t...

AP Physics 1: 1.2 Fields in Space
212 Views

Don't let this question about gravitational forces get you down! Yeah, yeah...that was an easy joke. You get what you pay for. 

AP Physics 1: 1.3 Fields in Space
209 Views

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.

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AP Physics 1: 1.3 Fields in Space 209 Views


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Description:

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.

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Transcript

00:04

Here's your shmoop du jour brought to you by doubling the size

00:07

of the planet and we thought our backpacks were helping out all right [Boy carrying an oversized backpack on a school bus]

00:12

well if the mass of the earth suddenly doubled in size what would happen to the

00:15

strength of the gravitational force and here the potential aims we have

00:20

double or quadruple okay if we went with our gut and just thought [mans belly popping his shirt open]

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!

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