Using Gravitational Force as a Measurement Tool
Answer the following questions about the results of this activity. Record your answers in the boxes.
Send your completed lab report to your instructor. Don’t forget to save your lab report to your computer!
Record your data from Activity 1 in the boxes below. Enter the data for the sample you used in each trial (5000 rpm, 10000 rpm, etc…) in the appropriate columns and the corresponding g-force, number of layers, and position of layers position results.
You will need to use the following formula to assist with your laboratory report: G-force =0 00001118 x radius of centrifuge arm x (rpm)2 The radius of the centrifuge arm for this instrument is 10 cm.
Speed | 5000 rpm | 10000 rpm | 15000 rpm | 20000 rpm | G-force | 2795 | 11180 | 25155 | 44720 | Number of Layers | 2 | 4 | 5 | 3 | Position of Layers | One at top of tube and one in middle of tube | Two at top of tube and two in middle of tube | Two layers at top of tube, one layer in middle of tube and two layers at bottom of tube | Two layers at top of tube, and one layer filling up half of tube | Explain what happens to the G-force as the speed of the centrifuge increases. The G-force increases as the speed of the centrifuge increases. Which is likely the best speed to separate the components of this soil sample? Why? The best speed to seperate the components of this soil sample would be 5000 rpm because there are only two layers so the soil is more separate in that speed. Describe in which layers you are likely to find the organic matter, gravel, sand, silt, and clay at the following speeds: 5000 rpm 15000 rpm The layer you are likely to find the organic matter, gravel, sand, silt, and clay is 15000 rpm because there are five layers so you will find