5.4

·         5.4 recall and use the relationship between pressure, force and area:

        pressure = force / area

                  p = F / A

5.4 Starter

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Starter.ppt Download this file

5.2 Harder Questions

5.2 Harder Questions

07 October 2011

07:46

·         Collins p.106 Q.1-3. (Table of densities below)

Q1) 1.depends 2. Float 3.Sink 4.float 5.sink 6.sink 8.float

Q3) mass = 1930g

         Density = 19.3

`

         P = m / V

         19.3 = 1930 / V

         V = 1930 / 19.3 = 100cm(cubed)

         800+100 = 900cm(cubed)

 

5.3 Plenary

Drag'n'Drop Density (in kg per m3).swf Download this file

Remember: 1g/cm³ = 1,000kg/m³

5.3 Plenary 2 Corrected!

·         How can you make a cannonball float?

Explanation below…

 

 

 

 

Density of Iron =  7.9g/cm³ or 7,900kg/m³

Density of Mercury =  13.6g/cm³ or 13,600kg/m³

Density of an irregular solid

1)Measure the volume of the rock using “displacement” in a “Eureka”

2)Measure the mass

3)calculate the density (p = m / V)

Volume = 2.5ml

Mass = 7.3g

Density = 7.3/2.5 = 2.9g/cm(cubed)

5.3 Plenary 2

5.3 Plenary 2

04 October 2011

14:06

·         How can you make a cannonball float?

Explanation below…

 

 

 

 

Density of Mercury =  7.9g/cm³ or 7,900kg/m³

Density of Iron =  13.6g/cm³ or 13,600kg/m³