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

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Presentation transcript:

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

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

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.

Mistakes with measurements

What do these signs mean?

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 (cm 2 ) –English units: Square inches (in 2 ) Volume – Space occupied by an object. –SI units: Cubic centimeters (cm 3 ) –English units: Cubic inches (in 3 ) 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 = slugs 7

Length Measurements – Reading Scales

BABA

Length = High Reading – Low Reading

Volume Measurements – Reading Scales Meniscus – Curved surface of a liquid resulting from surface tension Definition: 1.0 cm 3 = 1.0 ml

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

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) The motor weighs more than the total number of weights. What can you do?

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

Area of a Rectangle: Sample calculations Area of a rectangle = Length (L) Width (W) (L) (W) Length = 20 in Width = 12 in Area = ? Length = ? Width = 12 cm Area = 456 cm 2 Length = 8.3 cm Width = 76 cm Area = ? Length = 20 in Width = ? Area = 100 in 2 Area = 240 in 2 Width = 5 in Area = cm 2 Width = 38 cm

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

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

Area of a circle: Sample Calculations Area of a Circle = Find the area of a circle with radius = 3 in: Find the area of a circle with diameter = 3 in: Find the diameter of a circle with area = 3 cm 2 : Find the area of a circle with diameter = 56 cm: area = in 2 area = 2463 cm 2 : area = 7.07 in 2 Dia = 1.95 cm

Volume of a Solid Cylinder Volume of a cylinder = (Area of circle) Length Find the volume of a cylinder with radius = 3 in Length = 5 in area = in 2 Volume = in 3 Area Length

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 in 3 Width = 2 inVolume = 2712 cm 3

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

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

SeaPerch Ballast Washers cm 3 V = π (2.2 2 – ) 0.3 = 3.80

Lab Team Work Organize notebook: measure all lengths in inches and cm. Measure all mass in grams. Measure volume in ml (cubic centermeters). 1.Measure lengths of Jenga blocks 2.Measure length of 10 floor tiles 3.Measure length of foam, pvc pipe, washer 4.Measure inside and outside diameters of foam, straight pvc pipe, and washers 5.Measure mass of SeaPerch parts (Float, PVC pipe, elbow (90° pvc), Tee pvc, motor assembly, steel washers) 6.Measure the mass of your balloon and balloon filled with water 7.Measure the volume of your Jenga block 8.Measure the volume of your SeaPerch parts (Float, PVC pipe, elbow (90° pvc), Tee pvc, motor assembly, steel washers) 9.Calculate volume of a Jenga block (rectangular solid). 10.Calculate volume of float (cylindrical volume) 11.Calculate volume of a washer (cylindrical volume) 12.Calculate the mass (grams)/volume for SeaPerch parts and water balloon filled with water.