Register to reply

How To Find The Drag and Lift Force?

by mymachine
Tags: drag, force, lift
Share this thread:
mymachine
#1
Feb6-13, 09:39 AM
P: 42
How can I find the drag and lift force such as below illustration?

http://s4.postimage.org/sxmnflttp/dragillustration.png

Below is my calculation:

http://s4.postimage.org/ao75d6r0d/dragcalculation.png
Phys.Org News Partner Science news on Phys.org
Mysterious source of ozone-depleting chemical baffles NASA
Water leads to chemical that gunks up biofuels production
How lizards regenerate their tails: Researchers discover genetic 'recipe'
jedishrfu
#2
Feb6-13, 10:05 AM
P: 2,939
I dont understand how is drag and lift related to a sliding block?
mymachine
#3
Feb6-13, 12:08 PM
P: 42
Quote Quote by jedishrfu View Post
I dont understand how is drag and lift related to a sliding block?
It's not a sliding block.

It's moving on the air.

berkeman
#4
Feb6-13, 12:33 PM
Mentor
berkeman's Avatar
P: 40,941
How To Find The Drag and Lift Force?

Quote Quote by mymachine View Post
How can I find the drag and lift force such as below illustration?

http://s4.postimage.org/sxmnflttp/dragillustration.png

Below is my calculation:

http://s4.postimage.org/ao75d6r0d/dragcalculation.png
Quote Quote by mymachine View Post
It's not a sliding block.

It's moving on the air.
Which block? There are two in the illustration. And which way is it moving? Where does this problem come from?
Travis_King
#5
Feb6-13, 12:39 PM
P: 840
Perhaps the illustration is showing that the block has a rectangular cross-section? Then, perhaps the block is moving to the right, in which case the 2000 N is the drag force?

I have never ever seen an FBD like this for fluid/aero dynamics...
mymachine
#6
Feb6-13, 12:53 PM
P: 42
Quote Quote by berkeman View Post
Which block? There are two in the illustration. And which way is it moving? Where does this problem come from?
Two?

Wrong.

As you can see from the first image, the "A" is the area of the surface which its depth is 10 m.

The motion is from right to left.

The snout is at the front and the flat is at the back.
jedishrfu
#7
Feb6-13, 12:55 PM
P: 2,939
Quote Quote by mymachine View Post
Two?

Wrong.

As you can see from the first image, the "A" is the area of the surface which its depth is 10 m.

The motion is from right to left.

The snout is at the front and the flat is at the back.
Be nice, we're trying to help and you didn't provide enough information to begin with.
mymachine
#8
Feb6-13, 12:59 PM
P: 42
Quote Quote by jedishrfu View Post
Be nice, we're trying to help and you didn't provide enough information to begin with.
Am I that really not so nice?

I just telling that was wrong.

No other purpose.
jedishrfu
#9
Feb6-13, 01:05 PM
P: 2,939
Quote Quote by mymachine View Post
Am I that really not so nice?

I just telling that was wrong.

No other purpose.
Okay, but its considered harsh to say it that way.

Instead most people would say: No, there's only one box.


Register to reply

Related Discussions
I Need to Find Drag Force Introductory Physics Homework 7
Hydroynamics: Stoke's Law, Find work done by drag force Introductory Physics Homework 0
Please help me to calculate drag force and lift force Advanced Physics Homework 8
Environmental force vs. Drag force acting on an object: Calculating motion parameters Introductory Physics Homework 0
Drag Force / Drag Coefficient Introductory Physics Homework 5