The world is filled with motion. Some motions just happen: the Earth revolves around the Sun, snowflakes fall to the ground, waves surge across the sea. Other motions are under our control. We walk. We pick up things. We ride our bikes. But whether the movement is a planet revolving or you playing a game, the motion happens because of force.

Just what is Force? Force is just a fancy word for pushing or pulling. If I push on something or pull on it, then I am applying a force to it. Forces make things move or, more accurately, make things change their motion. Two natural forces that affect most of the motion we are aware of are the force of gravity and electromagnetic forces. Gravity produces a force that pulls objects towards each other, like a person towards the ground. And magnetism produces a force that can either pull two magnets together or push them apart, depending on how they’re lined up. What is Friction? Friction is a force that makes the objects move together or at least have more nearly the same velocity. Say you were pushing a toy train across the floor. It doesn't take much effort or force, because the toy is light. Now say you try to push a real train. You probably can't do it because the force of friction between the train and the ground. The heavier the object, the stronger the force of friction. What is Gravity? Gravity produces a force that pulls objects toward one another. It is the force that keeps the Earth revolving around the sun and it's what pulls you to the ground when you trip. Newton’s laws of Motion Some consider Sir Isaac Newton to be the greatest English mathematician of his time and perhaps one of the greatest scientists the world has known. According to a story, Newton saw an apple fall to the ground and he figured out that the same force which caused the apple to fall also governed the motion of the Moon and the planets. In 1687 Newton published his three laws of motion in the "Principia Mathematical Philosophies Naturalism”. His three laws explained how the concepts of force and motion work.

NICE EXPERIMENTS IN OUTER SPACE

VIDEO: 0 GRAVITY OUTER SPACE

UNIT 7: FORCES AND MOVEMENT

DISPLAY UNITS 13, 14 AND 15

This is our Science display for these three units about Prehistory, Ancient History and Middle Ages. All students have done a Project but they decided which unit they wanted to work on. You should visit it because there are really good Projects, some are crafts (caves, huts...) others are posters, little displays or hand books. As other times, there are other Projects (PPTs, Prezzy presentations, Word documents...) that are up loaded to this blog.

I would like to say.....WELL DONE EVERYBODY!!!

Changes of Phase (or State)

The term 'change of phase' means the same thing as the term 'change of state'.
There are three states, or phases, of matter. They are:

• Solid
• Liquid
• Gas

When a substance changes from one state, or phase, of matter to another we say that it has undergone a change of state, or we say that it has undergone a change of phase.
These changes of phase always occur with a change of heat. Heat, which is energy, either comes into the material during a change of phase or heat comes out of the material during this change. However, although the heat content of the material changes, the temperature does not.

These changes of phase always occur with a change of heat. Heat, which is energy, either comes into the material during a change of phase or heat comes out of the material during this change. However, although the heat content of the material changes, the temperature does not.
Here are the five changes of phase.

Description of Phase Change	Term for Phase Change	Heat Movement During Phase Change
Solid to liquid	Melting	Heat goes into the solid as it melts.
Liquid to solid	Freezing	Heat leaves the liquid as it freezes.
Liquid to gas	Vaporization, which includes boiling and evaporation	Heat goes into the liquid as it vaporizes.
Gas to liquid	Condensation	Heat leaves the gas as it condenses.
Solid to gas	Sublimation	Heat goes into the solid as it sublimates.