Static Electricity 10th May / Force 11th May

Static Electricity 10th May

What is Static Electricity?
An electric charge, typically produced by friction, which can cause sparks or will attract dust.
When a plastic ruler/pen is rubbed on wool it will attract hair and small pieces of paper.
Electroscope

Forces 11th May

What is a force?

Force is a strength and an energy that attributes of physical movement/ action. It can cause a resting object to move towards something. Force is a pull and push that causes an object to move, stop or change direction. A force is anything that makes an object accelerate. 

What are different types of forces?

Contact forces:

- Friction

- Air Resistance 

- Tension

- Support 

Non Contact forces act at a distance

- Gravitational force
- Magnetic force
- Electrostatics

Which force does static electricity belong to?

Electricity

Mass vs Weight. What is the difference between mass and weight? 

Weight is the force of gravity acting on the mass and the mass is the amount of matter/ stuff in something the object.

4th May Flying a paper helicopter

Helicopter

This is my paper helicopter

Shortest time: 1.02

Longest time: 3.94

3rd May Helicopters

Helicopters 3rd May

History of Helicopters

Date: 1100

Where: ----------

Who: Chinese

1100 - Chinese invented a flying toy that had some of the same principles as the helicopter.

Date: 1483

Where: ----------

When: Leonardo Da Vince

1483 - Leonardo Da Vinci had sketches of a helicopter-like flying machine.

Date: 1784

Where: ----------

When: Launoy and Bienvenu

1784 - two French men (Launoy and Bienvenu) built a feathered-model helicopter.

Date: 1843

Where: ----------

When: George Cayley

1843 - Sir George Cayley invented the steam-driven chopper.

Date: 1907

Where: ----------

Who: Paul Cornu

1907 - Paul Cornu built a full-sized helicopter. It cleared the ground for a few minutes, but remained tied down by ropes.

Date: 1916

Where: ----------

Who: Professor Theodore von Karman and Lieutenant Stefan Petroczy 

1916 - Professor Theodore von Karman and Lieutenant Stefan Petroczy built a working helicopter. However, because it didn't carry passengers, it was not officially recognized.

Date: 1931

Where: ----------

Who: Gerald P. Herrick

1931 - Gerald P. Herrick converted an airplane into a helicopter. It was able to land at a steep angle.

Date: 1931

Where: ----------

Who: Focke Achgelis

1938 - the German-made Focke Achgelis Fa 61 was the first official helicopter.

Date: 1939

Where: ----------

Who: Igor Sikorsky

1939 - Igor Sikorsky made the first practical flight in the United States

Link

- What forces are acting on flying helicopters?

Thrust, Drag, Lift and Weight 

- Which force is needed for flight?
= Lift

When an airplane flies, the wing is designed to provide enough Lift to overcome the Airplane’s Weight. also, while the engine provides enough Thrust to overcome Drag and move the airplane forward.
- What metal are helicopters made from?
Aluminium and Titanium 

Careers in Science

Careers in Science 

List of jobs in Careers Science

Examples of jobs 

Veterinarian......

Nurse injured birds back to health for re-release into the wild.

   

Give pets their vaccines, like rabies shots, to help keep them healthy.

Physics........

Design a laser to fix people's vision problems.

Develop clean, unlimited fusion energy.

Climate Change Analyst could......

Use existing climate data to create mathematical models of what will happen to ocean and land temperatures in the next 50 years.

Create graphics and presentations to educate the public about climate change and its impacts.

Geographer could......

Define the terrain of another planet, so that engineers can design an exploration vehicle.

Create topographical maps to show how the coastline has changed over time.

Electrician......

Install lights in a stadium so teams can play night games.

Test the grounding on swimming pool equipment 

Chemist......
Discover new processes that could solve the world's energy crisis.

Help discover new medicines that alleviate pain or cure diseases.                                                               Astronomer...... Use sensitive radio telescopes to spot comets and asteroids with the potential to impact Earth.                                                         Investigate how galaxies are formed and if super massive black holes live at their centres.                               Chemical Technician...... Analyse water samples for pollution to ensure the public's health.                                                     Test oil additives to see if they improve engine lubrication.                                      Geoscientist...... Discover new ways to extract oil from rocks—needed for transportation, food, fabrics, plastics, and more.

Christchurch water

1. Chch Storm water 
- What is it? 
Water that comes or fall from the sky resulting from heavy falls of rains or snow.
- Where does it go?
The storm water goes through a large network of public and private pipes, drains and water ways all leading to the sea, streams rivers, ponds, lakes and wetlands. It sometimes - What contaminates it?
Storm water, instead flows over streets, parking lots and roofs and into a water body or storm drain. Storm water is worsened by human activities. They can contain nitrogen and phosphorus pollutants from fertilisers, pet and yard waste.
Any thing that you put in the drains.

2. Chch Waste water
 - What is it?
Water that has been already used from pipes, drains, industry etc.
 - Where does it go?
Maintain systems to provide the community. They give a safe, healthy and appropriate treatment and discharge of it's water.
 - What contaminates it?
- The things that shouldn't be in the water like: powder, soap etc.

3. (i) Where does Chch gets it water?

Chch gets its water from the wells within the city that has been sunk down into the aquifers. In Chch there is 55 locations around the city where water is pumped into the pipe network. 

(ii) How is it purified?
They use treatment and they do regular testing   
(iii) What pollutes our city water before we drink it?
Any chlorine and bacteria infection called e.coli.

4. Where does Auckland's water supply come from? (May be more than 1 place)
Auckland's water supply comes from 10 dams one river and one underground source. 

5. What water bourne disease and parasites can we catch in NZ? (Hopefully not in Chch)
Giardia is a food- and water-borne disease. It is caused by a parasite, that is found in the gut of infected humans and animals like: cattle, sheep, cats, dogs, rats and possums.
- What do they do to us? 
It makes you sick and its an illness that affects the digestive tract- in your stomach and intestine. Giardia is protected by an outer shell that allows it to survive outside the body for long periods of time and makes it tolerant to chlorine disinfection.
.- How do they affect us?
It affects our digestive tract in our stomach and intestine.


6. Chch's waste water is treated after use 
- Where is it treated?
 Wastewater flows by gravity into the pump stations, which pump the wastewater from low areas around the city. It's particularly near the Avon and Heathcote Rivers. Five terminal pump stations then pump all the flow to the treatment plant.
- What are the steps involved in treating it?
The wastewater flows into screens catch, the rags and tanks then trap the grit before the flow goes into the sedimentation tanks.The rag and grit is removed and disposed of. About 2 tonnes of rag and 2 tonnes of grit are removed every day.The wastewater then passes through primary sedimentation tanks. Heavy organic matter settles to the bottom of the primary sedimentation tanks and is scraped to one end and pumped to the digesters for treatment. (And more) (The picture below shows how it works or the steps involved in treating) Link to website, read more to be understood

- What happens at each stop?
That it's all involving the water to be treated or to be clean.
- How long does each step take?
Not quite sure, but its 16 days for the clear liquid from the clarifiers to flow through the oxidation pond.
- Where does the treated waste water go?
Power Generation, to the ocean outfall, odour control or Bio solids drying machine that goes to land Remediation.

Chemist June 14

Chemist June 14

* What does a chemist do?
A chemist is a scientist who researches and experiments with the properties of chemical substances. They measure the effects of chemical compounds in various situations and study inter-chemical reactions.

* Practical: Big Pieces / Small Pieces
   Use: Quiz Eze Tablets
   Expt: For each of the following use 60 ml water and record to dissolve completely. You will have 4 beakers.
a) Use a whole tablet
b) Cut 1 tablet in half and put both into water
c) Cut 1 tablet into 4 pieces and put all 4 pieces into water
d) Crush 1 tablet and add all of it to water

Result:                               Time:
Whole tablet                      15:00 minutes
Halved tablet                     11:17 minutes and seconds
Quartered tablet                   
Crushed tablet                   2:15 minutes and seconds

Explanation:
The crushed one works faster than the whole tablet because the crushed one is easier to be dissolve by the water.

Food Scientist

Food Scientist

Look at: - texture, taste

              - causes of food going off / bad making new foods

              - Best ways to package food

              - Shelf life (how long the food lasts in good condition)

              - Evaluate the food

              - Interaction of ingredients used

              - Improving + changing flavours

              - Affect of bacteria  -----> spoil the food, causing illness.

Ways to preserve food

eg. canning, freezing, bottling, adding salt, adding preservative

Checking how cooking affects the ingredients 

Sherbet

1/4 c icing sugar

1 t Raro

1/4 t citric acid

1/4 t tartaric acid 

1/4 t baking soda

- Add together in a plastic bag.

- Mix

- Enjoy!!!

 Evaluation:
The sherbet was good and sour, but i think for me, we could improve it when we make it more sour.