Question

Who here is good with Geometric Series?

Answer 1

don't ask who's good, just post question

Answer 2

We'll help where we can. I have some knowledge of it

Answer 3

i can help too =D

Answer 4

whoo, that's three people xD

Answer 5

Um ok, well I have find the geometric sum of this geometric series. Here is the series:
84, 35, 15, 10, 5.

But once I use the formula, the sum is completely different from actually just adding the numbers. Do you understand what I mean?
And thank you guys :)

Answer 6

are you sure it's geometric serie? because
\[\frac{35}{84}\neq\frac{15}{35}\]

Answer 7

Yeah, I don't think that's geometric. Maybe a typo?

Answer 8

Yeah that's the part that I don't understand, cause I have this mini project where I have to measure the height of a ball after each bounce for 5 bounces. So those were the numbers I got.

Answer 9

To be honest, it really doesn't make sense haha

Answer 10

Did you measure those bounced, or were they given to you?

Answer 11

why do you think you will get geometric serie from bouncing balls?

Answer 12

That isn't a geometric series. It is just a collection of the heights of a ball as it bounced. A geometric series would have a consistent factor by which its height/value reduced or increased.

Answer 13

I had to measure them, but part of the project it says I have to do that. The project really doesn't fit together.

Answer 14

The project is revolving around geometric series.

Answer 15

is it physics or math project?

Answer 16

I'm guessing the project assumed the ball's height would reduce at a constant rate, but as your results have shown, that isn't the case.

Answer 17

Tomas, sometimes in bouncing ball problems, they state each successive bounce is 80% of the previous bounce. Then it would be geometric. but these numbers don't agree tho

Answer 18

@slaaibak if it's 80% in theory you probably won't get 80% by doing experiment :P

Answer 19

This is a math project

Answer 20

haha yeah, I know. was just an example.

Answer 21

Hm, oh well I'll just leave my results the way they are, maybe my teacher won't notice haha. Thank you so much everyone.

Answer 22

Is it a requirement that your project focuses on balls? You could model many other things using a geometric series.

Answer 23

well you can't use geometric series sum formula for numbers which are not from geometric serie, so if you need sum you should just add them

Answer 24

@EbnorEqvine yeah it has to be on balls :/
@Tomas.A Yeah i think I will just do that, thanks.

Answer 25

Ah, ok. Never mind then.