SCIENCE ROTATIONS FRIDAY

This Friday our class will be conducting Science Experiments.

I will provide most materials – those in –  bold black  print-  students have offered to bring.

BIOLOGICAL   SEEDS

 Kitty   Daisy  Caiomhe   Vivienne 

Investigating which is the best substance to plant seeds.

You need   3   ice cream containers

soil   sand   wool     gloves

 

BIOLOGICAL   ICE

Lauren   Jessica   Zac   Dylan

Investigating what happens to ice if you add various substances or chemicals such as sodium {salt} and vinegar

You need   ice blocks – 3 jars   salt – water    food dye    gloves

 

 

BIOLOGICAL  PLANTS    CELERY/ CARROT SOAK  

Oliver   Will B

Investigating how plants draw water.

You need   celery   water   jars { 2 }

food dye   art smocks   and   gloves

 

EARTH   Eclipse    

NATALIE AND AVA

Investigating  a solar eclipse and how this can be both viewed safely and replicated

You need   torch   black paper pin   white paper

 

PHYSICAL SCIENCE      MAGNETO      – Magnetic fields

James     Alex   Keira

Investigating magnetism

You will need    magnets 2 pairs   compass   paper clips

 

 

CHEMICAL   SCIENCE    VOLCANO

Will H   Will P   Jack &  Lachie

Investigating   Chemical Reactions

Volcano model   bi carb    soda    vinegar

 

 CHEMICAL   SCIENCE     –

 Angus   Brandon 

 Investigating   Chemical Reactions

What you need

mentos and coke  and plastic mug  plastic bottles   bi carb soda

 

AMAZING SCIENCE NO 4 – BIOLIGICAL SCIENCE – TRANSPIRATION

OUR LAST INVESTIGATION WAS LOOKING AT HOW PLANTS TRANSPIRE  WATER.

As you can see it is a fairly simple procedure. We place a plastic bag over a potted plant {chrysanthemum} and secured it with tape around the base of the pot .

We left the plant overnight and next morning eagerly  removed the plastic for inspection.

Predictions

  • the plant will with die
  • it will be very droopy
  • it will need of some water

What we found

Zac – It’s wet {on the inside of the plastic}

 

Transpiration investigation.  You will need – a clear plastic bag and an elastic band.                                                                                   This experiment will show you how much water is transpired through the leaves of plants.                                                                         Try this with a few different plants to see if the results are different.                                                                                                                  Many plants take water in through their roots and pass it out through their leaves through tiny holes called stomata                                                                                                                                                                                                                      Step 1 Tie a clear, clean plastic bag firmly around some leaves on a bush, taking care not to harm it. Make sure the bag has no holes in it.                                                                                                                                                                                                                       Step 2Check the bag daily to see what happens. Are all bushes the same?

Amazing Science No 3 CHEMICAL REACTION – ENERGY YEAST AND SUGAR

So here we are with our third experiment – looking at chemical reaction and energy.  After seeing Professor Bunsen work his magic with all his amazing experiments , we thought we investigate how chemical reactions can create energy. This experiment required placing a teaspoon or two of yeast into a plastic bottle and then adding some water – one cube of sugar before placing a balloon over the lid. We all were hoping the balloons would rise.

Student thoughts /predictions –  ”I think it will rise because of the yeast – isn’t meant to make things rise? Will H          ” The balloon will pop!”  Oliver                It will lean ‘- Keira

Results – WOW WEE!  – amazing – the balloons all rose upright – some quicker than others – some bigger – some smaller.

Factors which we observed which influence the outcome:

  • the amount of yeast
  •  the size of the bottle
  • the amount of water
  • mixing sugar with the yeast

 

AMAZING EXPERIMENTS N0 2 PARACHUTES – FLIGHT – PHYSICAL FORCES

Like our recent work with paper planes we continued our investigation into the forces of gravity though constructing parachutes.  Again we went on to the oval and the adventure playground. Unlike the planes this was a little more challenging.

We discovered that

  • the greater the area of the chute canopy – the greater the chance of a slower fall
  • the smaller the area the higher you had to throw the chute in order for it to work.
  • We also found that you had to be careful with the object or weight you would tie your chute to because this was a critical factor in assisting your chute to free fall slowly or plummet.


The Science

We all know that whatever is thrown up always comes down. This is due to a force called gravity – which comes from the centre of the earth and attracts everything (physical things, living beings) to the surface of the earth. This is why we are able to walk on earth otherwise we would be flying around. Little children have great fun experimenting with this idea – especially when it comes to throwing things on the floor and expecting other people to pick them up!

One of the objects that obey this law of gravity is the parachute. In real life, parachutes are very valuable since they used in emergency situations when people need to exit off a plane that is not functioning correctly. The parachute allows a person to land on the ground safely, but requires lot of training. The time taken to reach the ground depends on the weight of the person, the wind speed, parachute size etc. You too can create a parachute at home and experiment with it.

 

HOW  DOES  IT   WORK? Why doesn’t the toy fall to the ground immediately as normal? Since the toy is attached to the plastic sheet, when it begins to fall air fills up in the canopy and resists or prevents free fall. This force is acting upwards and we still have the force of gravity acting downwards. If the forces were equal in strength, the parachute would not move; it would be stuck in the air, but since gravity is stronger, the parachute is attracted downwards and so it floats down slowly.

Working of a parachute

 

AMAZING SCIENCE INVESTIGATION NO 1 – HOW DO PAPER PLANES FLY?

Aerodynamics

This week we have been conducting some amazing scientific experiments. We began with making paper aeroplanes. We were keen to see the factors which affect them and if we can work out the forces {physics} behind this. We made a host of planes of various shapes and sizes. They all either glided or flew depending upon their designs. Some had built in plastic straws to add stability, others wide wings and some pointy noses.  We went on the oval and later onto the adventure playground to throw them from an elevated position.

Student ideas to key question –    Zac  ” I think the air will lift it up.”   – “Kitty  The air below is pushing up.”      James “The wings will capture the air and glide/fly.”

So how does a paper plane fly?

Aerodynamics

What makes a paper airplane fly?  Air — the stuff that’s all around you. Hold your hand in front of your body with your palm facing sideways so that your thumb is on top and your pinkie is facing the floor. Swing your hand back and forth. Do you feel the air? Now turn your palm so it is parallel to the ground and swing it back and forth again, like you’re slicing it through the air. You can still feel the air, but your hand is able to move through it more smoothly than when your hand was turned up at a right angle. How easily an airplane moves through the air, or its aerodynamics, is the first consideration in making an airplane fly for a long distance.

Drag and Gravity

Planes that push a lot of air, like your hand did when it was facing the side, are said to have a lot of “drag,” or resistance, to moving through the air. If you want your plane to fly as far as possible, you want a plane with as little drag as possible. A second force that planes need to overcome is “gravity.” You need to keep your plane’s weight to a minimum to help fight against gravity’s pull to the ground.

Thrust and Lift

“Thrust” and “lift” are two other forces that help your plane make a long flight. Thrust is the forward movement of the plane. The initial thrust comes from the muscles of the “pilot” as the paper airplane is launched. After this, paper airplanes are really gliders, converting altitude to forward motion. Lift comes when the air below the airplane wing is pushing up harder than the air above it is pushing down. It is this difference in pressure that enables the plane to fly. Pressure can be reduced on a wing’s surface by making the air move over it more quickly. The wings of a plane are curved so that the air moves more quickly over the top of the wing, resulting in an upward push, or lift, on the wing.

The Four Forces in Balance

A long flight occurs when these four forces — drag, gravity, thrust, and lift — are balanced. Some planes (like darts) are meant to be thrown with a lot of force. Because darts don’t have a lot of drag and lift, they depend on extra thrust to overcome gravity. Long distance fliers are often built with this same design. Planes that are built to spend a long time in the air usually have a lot of lift but little thrust. These planes fly a slow and gentle flight.

 

CHALLENGE  — Our furthest flight was around 15metres  – three designs – Kitty – Zac – and Alex all manged this feat.

CAN YOU DO BETTER?

 

 

SCIENTIFIC COLLABORATIONS

IMG_1931[1]IMG_1932[1]Today we investigated the four domains of science 

The children COLLABORATED in groups with students made up from across all three grades.

They had to classify images and matching statements from a random collection prepared prior to the lesson.

In a magnificent afternoons work they created posters  – some solely devoted to one sphere eg ; Earth Science – others divided their posters into four categories displaying Physical – Biology – Chemical  – Earth

IMG_1905[1]IMG_1934[1]SCIENCE COLLABORATIONS - CLASSIFYING THE FOUR SPHERES OF SCIENCE