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How To Find The Drag and Lift Force? 
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#1
Feb613, 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 


#2
Feb613, 10:05 AM

P: 3,093

I dont understand how is drag and lift related to a sliding block?



#3
Feb613, 12:08 PM

P: 42

It's moving on the air. 


#4
Feb613, 12:33 PM

Mentor
P: 41,276

How To Find The Drag and Lift Force?



#5
Feb613, 12:39 PM

P: 851

Perhaps the illustration is showing that the block has a rectangular crosssection? 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... 


#6
Feb613, 12:53 PM

P: 42

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. 


#7
Feb613, 12:55 PM

P: 3,093




#8
Feb613, 12:59 PM

P: 42

I just telling that was wrong. No other purpose. 


#9
Feb613, 01:05 PM

P: 3,093

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


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