# AP Physics 1: 1.1 Fields in Space

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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 this shmoopy AP Physics question!

AP Physics 1 | Fields in Space |

Language | English Language |

Science Practice 2 | Using math appropriately |

### Transcript

earth's gravity If a student weighs a hundred pounds on

earth how much would he weigh on planet zi knock

and here the potential answers right there Okay well if

we just went ahead and guessed b since that's half

of one hundred fifty pounds Well a good job that's

Correct But while we appreciate a good guesser let's take

a look at the mass so we can understand why

b is the right answer Well wait is the measure

of gravity's force on the mass of an object The

equation that expresses this relationship is wait equals mass times

gravity right there Weapons of mass gravity Okay well on

earth gravity equals nine point eight meters per second squared

let's Change meters toe feed and work with thirty two

feet per second squared And since we already know the

students wait one hundred fifteen pounds we can figure out

his mass with a little algebra if hundred fifty pounds

e equals m multiplied by thirty two then we couldn't

solve the equation by dividing both sides by thirty two

which would give us a mass of four point six

nine Now on xena the gravity is half a strong

so that means g now equals sixteen feet per second

squared In this case we multiply sixteen feet per second

squared by four point six nine slugs and we'd get

seventy five pounds So next time we need to drop

a few pounds without diet or exercise We'll just hop

on a spaceship take a left past neptune and in

a few hundred light years we'll get to z knock

And we just need to remember to bring a gift

for the sinak ian's They're pretty cool but we'll really 00:01:45.802 --> [endTime] kind of needy