THE FEET CAN MEASURE THE HEIGHT

The bones of the feet can tell a lot about a person. What do feet reveal about a person's height? Forensic anthropologists team up with law enforcers to help solve crimes.

Bones of the feet can reveal an interesting fact about an individual. Let's combine math with forensics to see how.

Create a spreadsheet.

Make a chart and list the individuals name, height, and foot length.

Names                             Foot size                             Height

Reige                               24.2cm                                 1.56    = 15.3%

Daniel                              24.8cm                                 1.60    = 2.0%

Greg                                22cm                                    1.39     = 15.8%

Brielle                             20cm                                     1.48    = 13.5%

Activity: Scientific Method: Use the scientific method to write up this experiment.

1.  Aim: Base on someone feet size we can measure their height.
2.  Hypothesis: A rough estimate of our height.
3.  Method: 

Have the students in your group remove their shoes and measure their height.
Measure the length of the adult's left foot from the wall to the tip of the big toe.
Examine the numbers. Do you see a pattern? Divide the length of each person's left foot by his/her height. Multiply the quotient by 100. What do you get? You may also want to use the calculator on a computer for this activity

1. Equipment: 1 metre ruler, 30cm ruler, and calculator
2. Results: I found out that my height is 156cm and the size of my foot is 24cm.
3. Summary: The police investigator and forensic scientists use 15% of a persons foot length is equal to their height.
4. Conclusion: By knowing what a persons foot size is we can determine their approximate height.

What is the white powder?

White powder test?

A forensic scientist may discover powder at a crime scene. In order to determine if it is illegal or not the crime lab will identify the substance using chemistry. Take on the role of a forensic chemist to identify unknown substances.

Become a Forensic Chemist by following these procedures and filling in the Powder Analysis Chart with your results. 

Complete the appearance, texture, and smell activities before opening the vinegar and iodine bottles.

Record your findings in the Powder Analysis Chart below.

Aim: To determine how different powders feel, look and react to other substances.

Hypothesis: It will dissolve

Equipment: 

 Baking Soda 

 

Cornflour 

 

Sugar 

 

Salt 

 

Iodine 

 

Vinegar 

 

Magnifying glass 

 

Eye drop 

 

Black card 

 

Tea spoon / stick

Method: 

1. Place one-fourth teaspoon (1 ml) of the four white powders on a sheet of black construction paper. Label the powders with your pen.
2. Study the powders with the magnifying glass. Examine what each powder looks like. How would you describe the powder's shape. Does it have large or small grains? Your observations should be written in the appearance column of the chart.
3. Examine the powders further by rubbing each powder between your fingers. Describe how each powder feels in the Texture column of the chart.
4. Determine if there is a smell to any of the powders. Record your findings in the Smell column of the chart.
5. Take the eyedropper and place a drop of water on each individual powder. Examine what happens? Do the powders dissolve? Is there a reaction? Write your observations in the Reaction to Water column.
6. Place one-half teaspoon (2ml) of each powder in a separate jar. Add 2 drops of iodine to each jar using the eyedropper. Record what happens in the Reaction to Iodine column. Iodine should be handled with care.

Findings:  

Powder Analysis Chart

                                                                                                  

Substance    Appearance   Texture    Smell     Water     Vinegar     Iodine

Cornflour = B           - small           - smooth      - No Smell - Dissolves           - Doesn't dissolve

Sugar = D                - large            - Course       - Dead ant - Dissolves           - Doesn't dissolve

Salt = C                   - medium        - Fine           - No Smell - Dissolves           - Doesn't dissolve

Baking soda = A     -medium          - Fine          - No smell - Dissolves           - Dissolve

Comparing test results of substances that are known help Forensic Scientists identify unknown substances.

Summary: 

Solve the crime

The case of the Barefoot Burglar

http://www.cyberbee.com/whodunnit/crimescene.html

In groups of 4 or five you are going to need to use your forensic knowledge to solve a crime.
Using the clues found at the crime scene, determine which of the four suspects is the "barefooted burglar"? 
What do you think was the motive for this crime? 
Write the results of your findings and convince a jury of your peers.

At approximately 7:15 a.m., Friday morning, Mrs. King, the science teacher, thought something was fishy as she walked down the hall and noticed that her door was open. She walked into her classroom and immediately discovered that the small aquarium had been broken and her prized gold fish were gasping in the sink. Beside the broken aquarium were the shattered remains of the pink piggy bank that had been on the shelf above the aquarium. A can of blue paint was spilled on the floor. Footprints of a barefooted burglar led to an open window. Bits of a white powdery substance were found next to the broken, empty, piggy bank. The only other item found was a half-eaten large chunk of chocolate candy.

When the police arrived they immediately began to gather forensic evidence.

• Sticky fingerprints were lifted from the aquarium and piggy bank. The painted footprints were measured. The chunk of chocolate candy was collected for examination. It appeared there were teeth imprints.
• The white powdery substance by the piggy bank was carefully placed in a plastic bag and taken to the forensic chemist for identification .

Dan the man: 

Name	Motive	Clues
Lou Lou		Clumsy, tends to slip and break things, (Glass Pig)
Jake the Jock		Holes in teeth, matches with chocolate teeth marks,
Peg the Leg		?
Dan the man	Needs money for new Bugle.	Holes in teeth, Matches with Chocolate. Always steals vinegar, vinegar mixes with the fine white powder. Always steals chocolate kisses, kisses at crime scene.

Findings: Lou is Clumsy, tends to slip and break things, (Glass Pig). Jake the jock is Holes in teeth, matches with chocolate teeth marks.Dan the man was the bugler because we find a lot of clues about Dan the man and especially the vinegar and the chocolate kisses. Peg the Leg i don't know about her.

Paper Planes

Paper planes

Making a paper plane

Q. What are the forces acting on a paper plane?

There are 4 forces acting on a paper plane.

 

Thrust - pushes the plane forward
Lift - pushes the plane up.
Gravity - (or Weight) pulls the plane down.
Drag - pushes the plane backwards.

Challenge:  To find a paper plane that beats the rest of the class.

M

Aim: I want to find a paper plane design that can fly the furthest and beat the rest of my class.

Monday, 20 March 2017

Solve the crime

The case of the Barefoot Burglar

http://www.cyberbee.com/whodunnit/crimescene.html

In groups of 4 or five you are going to need to use your forensic knowledge to solve a crime.
Using the clues found at the crime scene, determine which of the four suspects is the "barefooted burglar"? 
What do you think was the motive for this crime? 
Write the results of your findings and convince a jury of your peers.

At approximately 7:15 a.m., Friday morning, Mrs. King, the science teacher, thought something was fishy as she walked down the hall and noticed that her door was open. She walked into her classroom and immediately discovered that the small aquarium had been broken and her prized gold fish were gasping in the sink. Beside the broken aquarium were the shattered remains of the pink piggy bank that had been on the shelf above the aquarium. A can of blue paint was spilled on the floor. Footprints of a barefooted burglar led to an open window. Bits of a white powdery substance were found next to the broken, empty, piggy bank. The only other item found was a half-eaten large chunk of chocolate candy.

When the police arrived they immediately began to gather forensic evidence.

• Sticky fingerprints were lifted from the aquarium and piggy bank. The painted footprints were measured. The chunk of chocolate candy was collected for examination. It appeared there were teeth imprints.
• The white powdery substance by the piggy bank was carefully placed in a plastic bag and taken to the forensic chemist for identification .

Dan the man: 

Name	Motive	Clues
Lou Lou		Clumsy, tends to slip and break things, (Glass Pig)
Jake the Jock		Holes in teeth, matches with chocolate teeth marks,
Peg the Leg		?
Dan the man	Needs money for new Bugle.	Holes in teeth, Matches with Chocolate. Always steals vinegar, vinegar mixes with the fine white powder. Always steals chocolate kisses, kisses at crime scene.

Findings: Lou is Clumsy, tends to slip and break things, (Glass Pig). Jake the jock is Holes in teeth, matches with chocolate teeth marks.Dan the man was the bugler because we find a lot of clues about Dan the man and especially the vinegar and the chocolate kisses. Peg the Leg i don't know about her.