State the problem

State the problem

Find out about the topic

Predict outcome

Develop a procedure to test hypothesisRecord results of experimentCompare 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

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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.

Meas.Mass Vol. Density

No. Item (in) (cm) (in) (cm) (in) (cm) (in) (cm) (in) (cm) (g) (cm3) (in3) (cm3) g/(cm3)1 Jenga ---- ---- ---- ----2 SeaPerch box ---- ---- ---- ---- ---- ---- ----3 10 Floor tiles ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----4 Foam ---- ---- ---- ----5 pvc pipe ---- ---- ---- ----6 pvc elbow ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----7 pvc tee ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----8 washer ---- ---- ---- ----9 motor assembly ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----10 balloon (dry) ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----11 Balloon (water) ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

CalculatedVolumeLength ID ODWidth Height

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 (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

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Length Measurements – Reading Scales

Length Measurements – Reading Scales

BABA

Length Measurements – Reading Scales

Length Measurements – Reading Scales

Length Measurements – Reading Scales

Length Measurements – Reading Scales

Length Measurements – Reading Scales

Length = High Reading – Low Reading

Volume Measurements – Reading Scales

Meniscus – Curved surface of a liquid resulting from

surface tension.

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Definition:1.0 cm3 = 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) http://www.youtube.com/watch?v=DYDqB_G5PCo

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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 inWidth = 12 in

Area = ?

Length = ?Width = 12 cmArea = 456 cm2

Length = 8.3 cmWidth = 76 cm

Area = ?

Length = 20 inWidth = ?

Area = 100 in2

Area = 240 in2 Width = 5 in Area = 630.8 cm2 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 = 3.14159…

Diameter (D)

Radius (r)

D = 2rDiameter = 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 cm2:

Find the area of a circle with diameter = 56 cm:

area = 28.27 in2

area = 2463 cm2:

area = 7.07 in2

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 inLength = 5 in

area = 28.27 in2

Volume = 141.35 in3

Area

Length

Volume of a Rectangular Solid: Calculations

Volume of a rectangular solid = (L) (W) (D)Length = 8.3 cmWidth = 76 cmDepth = 4.3 cm

Volume = ?

Length = 20 inWidth = ?

Depth = 6 inVolume = 240 in3

Width = 2 inVolume = 2712 cm3

Sample Ballast WasherDia = 4.4 cmRadius (R) = 2.2 cm

dia = 1.8 cmradius (r) = 0.9 cm

Thickness (t) = 0.3 cm

Exit PassCalculate volume of washer

Read textbook: pages 7-16 (see outline)Quiz next Thursday on Chapter 1

SeaPerch Ballast Washers

cm3V = π (2.22 – 0.92) 0.3 = 3.80

Lab Team WorkOrganize notebook: measure all lengths in inches and cm. Measure all mass in grams.Measure volume in ml (cubic centermeters).1.Measure lengths of Jenga blocks2.Measure length of 10 floor tiles3.Measure length of foam, pvc pipe, washer4.Measure inside and outside diameters of foam, straight pvc pipe, and washers5.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 water7.Measure the volume of your Jenga block8.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.