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State the problem

State the problem. Find out about the topic. Predict outcome. Develop a procedure to test hypothesis. Record results of experiment. Compare hypothesis to experimental results. Lab report. SeaPerch Lab.

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State the problem

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  1. State the problem Find out about the topic Predict outcome Develop a procedure to test hypothesis Record results of experiment Compare hypothesis to experimental results Lab report

  2. SeaPerch Lab • Determine a numerical value to associate with various items to quantify the tendency to sink or float in water. • Class notes, textbook Ch 1, 2. Find the volume and mass of items. Compute and compare densities. 2. 3. 4. 5. 6. Lab report 7.

  3. Experiment • Identify commonly used units for length, volume and mass. • Compute the volume of simple shapes. • Measure the volume of various shapes. • Measure length accurately using a yard stick or meter stick. • Measure volume accurately using a graduated cylinder. • Measure mass accurately using a lab balance. • Calculate and compare Mass/Volume ratio of various parts.

  4. Mistakes with measurements

  5. What do these signs mean?

  6. Quantities to Measure • Length – Extent of something from end to end. • SI units: Centimeter (cm) • English units: inch (in) • 1.0 in = 2.54 cm • Area – Extent of a surface. • SI units: Square centimeters (cm2) • English units: Square inches (in2) • Volume – Space occupied by an object. • SI units: Cubic centimeters (cm3) • English units: Cubic inches (in3) • Mass – The amount of material making up an object. Measured with a balance. • SI units: Kilogram (kg) or grams (g) • English units: slugs • 1 Kg = 0.0685 slugs

  7. Length Measurements – Reading Scales

  8. Length Measurements – Reading Scales A B A B

  9. Length Measurements – Reading Scales

  10. Length Measurements – Reading Scales

  11. Length Measurements – Reading Scales

  12. Length Measurements – Reading Scales

  13. Length Measurements – Reading Scales Length = High Reading – Low Reading

  14. Volume Measurements – Reading Scales 35 Meniscus – Curved surface of a liquid resulting from surface tension. Definition: 1.0 cm3 = 1.0 ml 73

  15. Volume Measurements – Reading Scales Volume = High Reading – Low Reading

  16. Mass • Mass – The amount of material making up an object. Measured with a balance. Same mass no matter where you are. • In pool. • On moon. Moon walk (~8:24) http://www.youtube.com/watch?v=DYDqB_G5PCo The motor weighs more than the total number of weights. What can you do?

  17. Area of a Rectangle: Calculation Area of a rectangle = (L) (W) Width (W) Length (L)

  18. Area of a Rectangle: Sample calculations Length = 20 in Width = 12 in Area = ? Length = 20 in Width = ? Area = 100 in2 Length = 8.3 cm Width = 76 cm Area = ? Length = ? Width = 12 cm Area = 456 cm2 Width (W) Area = 630.8 cm2 Width = 38 cm Area = 240 in2 Width = 5 in Length (L) Area of a rectangle = (L) (W)

  19. Volume of a Rectangular Solid: Calculation Volume of a rectangular solid = (L) (W) (D) Width (W) Depth D) Length (L)

  20. Area of a circle: Calculation Area of a Circle = r = radius = center to edge of circle = 3.14159… Radius (r) Diameter (D) D = 2r Diameter = 2 * radius

  21. Area of a circle: Sample Calculations Area of a Circle = Find the area of a circle with radius = 3 in: area = 28.27 in2 Find the area of a circle with diameter = 3 in: area = 7.07 in2 Find the area of a circle with diameter = 56 cm: area = 2463 cm2: Find the diameter of a circle with area = 3 cm2: Dia = 1.95 cm

  22. Volume of a Solid Cylinder Volume of a cylinder = (Area of circle) Length Area Length Find the volume of a cylinder with radius = 3 in Length = 5 in area = 28.27 in2 Volume = 141.35 in3

  23. Volume of a Rectangular Solid: Calculations Volume of a rectangular solid = (L) (W) (D) Length = 8.3 cm Width = 76 cm Depth = 4.3 cm Volume = ? Length = 20 in Width = ? Depth = 6 in Volume = 240 in3 Volume = 2712 cm3 Width = 2 in

  24. Sample Ballast Washer Dia = 4.4 cm Radius (R) = 2.2 cm dia = 1.8 cm radius (r) = 0.9 cm Thickness (t) = 0.3 cm

  25. Exit Pass Calculate volume of washer Read textbook: pages 7-16 (see outline) Quiz next Thursday on Chapter 1

  26. SeaPerch Ballast Washers cm3 V = π (2.22 – 0.92) 0.3 = 3.80

  27. Lab Team Work Organize notebook: measure all lengths in inches and cm. Measure all mass in grams. Measure volume in ml (cubic centermeters). Measure lengths of Jenga blocks Measure length of 10 floor tiles Measure length of foam, pvc pipe, washer Measure inside and outside diameters of foam, straight pvc pipe, and washers Measure mass of SeaPerch parts (Float, PVC pipe, elbow (90° pvc), Tee pvc, motor assembly, steel washers) Measure the mass of your balloon and balloon filled with water Measure the volume of your Jenga block Measure the volume of your SeaPerch parts (Float, PVC pipe, elbow (90° pvc), Tee pvc, motor assembly, steel washers) Calculate volume of a Jenga block (rectangular solid). Calculate volume of float (cylindrical volume) Calculate volume of a washer (cylindrical volume) Calculate the mass (grams)/volume for SeaPerch parts and water balloon filled with water.

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