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# Lifting ForceFluid flow lab - 2015 nov

Finding the lifting force on an immersion body in a liquid

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### Lifting ForceFluid flow lab - 2015 nov

1. 1. University of Koya Faculty of engineering Chemical engineering department 2nd stage 2015-2016 Title : Lifting Force Name : Zhyar Arsalan Abdulrahman Group : A1 Date of EXP : 10/11/2015 Date of SUB : 17/11/2015
2. 2. Table of content 1- Aim of experiment……………… page 1 2- theory …………… page 2 3-Procedure ……………… page 3 4-tools……………… page 4 4-Table of reading ……………… page 5 5- Table of calculating: ……………… page 6 6-Discussion ……………… page 7 7-Refrence ……………… page 8
3. 3. Aim of experiment: Finding the lifting force on an immersion body in a liquid
4. 4. Introductions of theory: When a body is immersed in a liquid, a lifting force FA acts upon it which corresponds to the force due to weight of the displaced liquid: FA =𝝆. g . V = w . Vdis ……….. (1) V - Volume of immersed body = Volume of displaced water 𝝆 - Density of liquid (  Water = 1g/cm3 ) The lifting force FA is always directed upwards, and thus brings about an apparent weight loss of the immersed body: FG , water = FG - FA ……………(2)
5. 5. Procedure : *Fill the overflow vessel 1 with water until the liquid level h is precisely below the outlet pipe. *Position the empty measuring cup 3 underneath the outlet pipe. *Weigh out the three bodies 2 made of aluminum, brass and polyoxymethylenePOM using the spring balance: Force due to weight FG for each body. *Completely immerse the body suspended on the spring balance in the overflow vessel: Read off the displayed weight FG, Water Read off the overflowed water volume V.
6. 6. Tools: 1-body 2- container 3- stand 4- water
7. 7. Table of Readings: No. Material of the body FG (N) FG,water (N) Volume displaced (Vdis)(ml) 1 Aluminum 2.3 1.45 90 2 Brass 4.65 4.1 59 3 Polyoxymethelen 1.25 0.38 90
8. 8. Table of calculating: No. Material of the body FG (N) FG,water (N) FA (N) FG,water,th. (N) 1 Aluminum 2.3 1.45 0.882 1.41 2 Brass 4.65 4.1 0.578 4.072 3 Polyoxymethelen 1.25 0.38 0.882 0.368
9. 9. Discussion: 1-Discuss the differencebetweenthe values of the calculating and readings. ? The value of reading is contain FG and FG water And V dis weobtain by practical step first read the FG in air (aluminum or brass or polyoxymethylenePOM) and the FG water and Volume displacement , but calculating we need fining the FA and by theoretical step find the FG water and compare with the result I finded in practical need the number both is near . 2-Why is the weight of the body in the air greater thanthe weight of it in the water? Because a body is immersed in a liquid, a lifting force FA acts upon the body after the wight is decreased in water . 3-What is happening if the weight of the body in the water (FG,water) becomes zero. If body becomes zero must be the bodystay at top or goes up to top
10. 10. Refrence : In exp lab and slide share In google

Nov. 19, 2021
• #### RasaIbrahim

Oct. 22, 2020

Oct. 22, 2019

Finding the lifting force on an immersion body in a liquid

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