Why some objects float and others sink?

The bracelet sinks because it has bigger density than water.
The ball floats because it has lower density than water.
...

PROPERTIES OF MATTER

LIVING THINGS_5 KINGDOMS

LIVING THINGS_INTRODUCTION

Living things are made up of cells. Depending on the number of the cells they have, they can be UNICELLULAR or MULTICELLULAR. 

Living things perform three vital functions: reproduction, nutrition and respiration.

Living things are classified in KINGDOMS: monera, protists, animals, plants and fungus.

(unit_2) Simple Machines Song

(unit_2)Simple machines: types of levers

LEVERS

There are three types of levers: class 1, class 2 and class 3.

There are three main parts: point of support or fulcrum, resistance or load and force or effort


Class 1 lever:

The fulcrum is in the middle. It is between the force and the resistance.

Examples: Scissors and pliers

Class 2 lever:

The load or resistance is in the middle.

Examples: wheel barrels and nutcrackers

WHEELBARROW

NUTCRACKER

Class 3 lever:

The force or effort is in the middle.
Examples: stapler and tweezers

TWEEZERS

(unit_2) Machines and technology

Pulleys, simple machines:

Simple and complex machines:

LET'S DO SCIENCE! (SESAMESTREET GAMES)

DOES IT SINK OR FLOAT?

1. HYPOTHESIS. What do you think?

2. We TEST and OBSERVE

3. What happens? Is the hypothesis right or wrong?

4. Conclusion or big idea.

GAMES:

DOES IT SINK OR FLOAT?

UNDERWATER SINK OR FLOAT

(Unit_1) CHEMICAL AND PHYSICAL CHANGES

CHEMICAL CHANGES

   Oxidation
   Combustion
   Fermentation
 

PHYSICAL CHANGES

   Melting
   Evaporation
   Solidification
   Condensation
 

(unit 1)_ CHANGES IN MATTER AND TYPES OF CHANGES

PHYSICAL CHANGES*

The susbstance changes* but matter does NOT change.

Ex: water freezes*, but it is still water



CHEMICAL CHANGES

New substances are created and matter changes.

Ex: Wood changes into ashes* and gases when it burns.


TYPES OF CHANGES

• Irreversible: matter CANNOT RETURN to its original state.

• Reversible: matter CAN RETURN to its original state.

*change: canvi

*to change: canviar

*to freeze: congelar

*ash: cendra

(unit 1)_ TYPES OF MATTER

• PURE SUBSTANCES cannot be separated into other substances. Examples: iron, salt

• MIXED SUBSTANCES are made of two or more substances. Seawater* is a mixture of water and salt

*Sea: mar

Water: aigua

Seawater: aigua de la mar

( UNIT 1)_MASS, VOLUME AND DENSITY

Matter has two general properties:

• Mass is the amount* of matter in an object. We can measure* it in kilos.
• Volume is the space that an object occupies. We can measure it in litres.

Density is the relationship between mass and volume:

                                             Density=mass/volume

*amount: quantitat

*to measure: mesurar

(unit 1)_DESCRIPTION OF AN OBJECT

To describe an object you have to follow some steps:

1. Firstly, you have to write what it is.

2. Secondly, write the main material it is made of.

3. Finally, write the properties that you can observe or measure.

Here you have the example we did together:

(What is it?)This is a picture.

(Main material)It's made of wood.

(Properties)It isn't transparent, it's opaque. It's flat and rough. It's hard and stiff. It's not magnetic and it's insulator.

It's a square, it's 20 cm long and 20 cm wide. It weighs 22 g and it's colourful!

(UNIT 1)_PROPERTIES

BIG IDEA: 

Objects have many properties that we can observe directly and with tools.

WAYS TO DESCRIBE PROPERTIES OF DIFFERENT THINGS:

• Weight: g, kg, about as heavy as me...

• Size: 6 cm long, 4 cm tall, 3 cm wide...

• Temperature: 20ºC, hot, warm, cold...
• Shape: cube, round, cylinder, flat, pointy...
  
• Colour: red, yellow, dark blue, light blue...
• Texture: soft, rough, smooth, slippery...
• Flexibility: flexible, hard, squishy...

(www.sciencecompanion.com)

(unit 1)_MATTER (introduction)

BIG IDEA:
Objects can be described in terms of their properties and also in terms of the materials they are made of.

            - Object: table
            - Material: wood
            - Property: insulator