- #1

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I have a question and I want to quickly get an answer

how to calculate projectile motion with drag a formula even if it is hard would be good

mvh. patrick

sorry my spelling I'm from abroad

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- Thread starter patrickbc
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- #1

- 8

- 0

I have a question and I want to quickly get an answer

how to calculate projectile motion with drag a formula even if it is hard would be good

mvh. patrick

sorry my spelling I'm from abroad

- #2

mgb_phys

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The only difficulty is that the drag changes with speed, and of course the drag causes the speed to change - so you will need some calculus or a computer

see http://en.wikipedia.org/wiki/Drag_(physics)#Drag_at_high_velocity for a good explanation

- #3

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I can not find the formula

- #4

mgb_phys

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The formula for the force is

F_drag = 1/2 ρ v^2 Cd A

ρ is the mass density of the fluid,

v is the velocity of the object relative to the fluid,

A is the reference area, and

Cd is the drag coefficient

The force acts against the motion, you can use this along with the normal projectile equations.

F_drag = 1/2 ρ v^2 Cd A

ρ is the mass density of the fluid,

v is the velocity of the object relative to the fluid,

A is the reference area, and

Cd is the drag coefficient

The force acts against the motion, you can use this along with the normal projectile equations.

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- #5

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how ?

please write the whole formula

please write the whole formula

- #6

berkeman

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how ?

please write the whole formula

He did give you the formula. Did you read the link he provided above? What is the context of your question -- what are you trying to do? Is this for school work?

- #7

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- #8

berkeman

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hey sorry way I am a little stupid but what of it there are many and I would also like a description of the parameters

Here's a web page with more details about the formula. I found it by googling air resistance drag forumula.

http://en.wikipedia.org/wiki/Atmospheric_drag

.

- #9

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sorry but it is shown the same

- #10

berkeman

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sorry but it is shown the same

Yes it is the same. That is the equation for drag. Why is it not what you are looking for? What are you actually trying to do or calculate?

- #11

mgb_phys

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If they don't understand why they need a differential equation then posting one isn't going to help.

- #12

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I am looking for a formula which calculates the max throw distance

- #13

berkeman

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I am looking for a formula which calculates the max throw distance

Show us how you calculate it assuming no wind resistance first. Then maybe we can offer a hint of how to go about factoring in wind resistance. What year are you in school?

- #14

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v ^ 2 / 9, 82 * sin (2 * angle)

I am in the 8th Class

- #15

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there is none who has written a response and I still need one but I have another question, the weight is not a significant drag on and show how yes

- #16

berkeman

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v ^ 2 / 9, 82 * sin (2 * angle)

I am in the 8th Class

Does that equal the horizontal distance before landing?

Have you looked at the Stoke's Drag equations and simulation at the wikipedia.org link that I posted earlier?

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