# AP Physics 1: 2.3 Fields in Space

AP Physics 1: 2.3 Fields in Space. What is the gravitational force between the two planets?

AP Physics 1 | Fields in Space |

Language | English Language |

Science Practice 1 | Using representations and models |

### Transcript

by ten to the tenth kilograms Planet jelly bean has

a mass of five times out of planet acts If

the two masses air separated by a distance of five

by ten to eighteen meters what is the gravitational force

between the two planets And hear the potential answers All

right Well first of all planet jelly bean sounds delicious

Unless it's licorice flavored in which case it should be

renamed planet No thanks Before we get to dessert let's

figure out the gravitational force of these planets Pretty much

everything in outer space is really big and really far

apart So the numbers were dealing with in these calculations

are hard to even imagine Lucky for us physics helps

us make sense of the universe To calculate the force

between two objects The formula we use is as follows

force equals the gravitational constant times the mass of the

first object times the mass of the second object divided

by the square of the distance between them It looks

a little something like this thing Yeah all right A

quick aside the negative sign in front of the equation

indicates that the forces moving in words that is if

the planets were repelling each other the negative sign wouldn't

be there So now we can just plug the numbers

into the equation And when we put these numbers in

our fancy calculator like this we get a fancy solution

like this The force of gravity equals negative g Times

one point eight times ten to the negative fourteenth times

Kilograms per meter squared Cool But that mouthful is our

answer which in this case is option a If we

were to use the gravitational constant in the full numerical

form while then the answer would be in newton's like

option b But in this case we're not expanding the

constant so that wouldn't be the correct unit of measurement

here Oh if there really were a planet jelly beans

there'd probably be a lot more people interested in space 00:02:10.83 --> [endTime] travel