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AP Physics 1 Videos 69 videos

AP Physics 1: 3.3 Changes and Conservation Laws
192 Views

AP Physics 1: 3.3 Changes and Conservation Laws. What is the difference in work done?

AP Physics 1: 3.5 Changes and Conservation Laws
177 Views

AP Physics 1: 3.5 Changes and Conservation Laws. Which of the following would increase the rate at which the plate spins?

AP Physics 1: 2.4 Changes and Conservation Laws
172 Views

AP Physics 1: 2.4 Changes and Conservation Laws. Which of the following circuits should the students use?

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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.

Language:
English Language

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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