ملخص (الفصل الثاني – الثالث) علوم منهج إنجليزي صف رابع فصل ثالث

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البيانات

ملخص (الفصل الثاني – الثالث) علوم منهج إنجليزي صف رابع فصل ثالث


Lesson Summary

A molecule is a particle of matter that is made up of more than one smaller particles joined together

a. Dissolve- Substances mix together

b. Surface Tension- This is like a skin on water that allows insects to walk on water

c. Cohesion- Water is together. The molecules are together

d. Capillary Action- Water moves through our and plants

Water has 3 states- Solid, liquid and gas

Another word for gas is water

Physical change - BEGINS and ENDS with the SAME type Of matter. Example, clay. We can cut it. shape it, flatten it and it still remains as clay

Real world changes- A newly tmaght car. Within time, it gets old, rusty, and dented. The physical appearance (looks) change

Matter changes its state. Example, solid to liquid (ice to water). Liquid changes to solid (water to ice)

Melting - Solid changes to a liquid (ice to water) Mixture - two or more tygkS of matter that are mixed but keep its original properties e.g. a salad

Solution - A mixture in which one or more types of matter are mixed evenly in another kind e.g. lemonade, juice

Chemical Change : Begins when one type of matter ends with another of matter

Example is bread. We mix flour , milk, eggs together , bake it and it turns into bread

Another example is fire. We need wood and matches to make a fire burn

 


ENERGY iS the ABILITY TO DO SOMETHING. (TO do anything). Energy is all around us. It takes energy to cook , talk, walk , drive to etc

We get different kinds Of energy - We have learnt in class HEAT, LIGHT, MOTION

HEAT : Transfer thermal energy from one object to another. Example , the Sun making me hot when I stand outside

How is heat

Heat ALWAYS moves from a warmer to a cooler object. Example, a warm Object cools as it transfers heat. at the picture Of the toaster

• Temperature : Describes the HOTNESS or COOLNESS of an Object

we measure temperature With a THERMOMETER

As a thermometer warms, the liquid moves faster and RISES (up)

- As a thermometer the liquW to the (down)

- We measure temperature in CELCIUS (C)

• How heat

CONDUCTION : heat travel when 2 OBJECTS are TOUCHING (a on a stove) heat is transferred through LIQUIDS or GASES. a pot Of water, the water at the bottom will heat first

RADIATION : heat that travels through space / air. (fire burning and he Sun shining on earth)

INSULATOR : Does NOT transfer heat very well. Does not have electric heat

Example. juket. gloves

Transfers Heat VERY quickly. Has an electric heat. Example , metal is a example (pots)

 


CHAPTER 8 LESSON SUMMARY LESSON 6 MAGNETISM AND ELECTRICITY

• What magnet

Magnets PIJLL each other Magnets repel (push away) from each other

Magnetic Poles

All magnets have two poles. A NORTH pole and a SOUTH pole Opposites attract- North will attract south Like DO NOT ATTRACT - South and South will not attract , north and north will not attract

What are An area of magnetic force around a magnet

south are broucht •.caether Earth's Magnetic Field

Some of the inside of Earth is made up of iron. This iron creates a magnetic field that surrounds earth

What is an electromagnet

It is a coil of wire wrapped around a metal core such as iron

 Electric Motors- What is a

A generator chanqes mechanical energy into electrical energy

• Alternating Current. - Flows in one

direction and flows out in the direction yoltaqe- is the strength of power source. It

is usually measured in volts

Transformer * — Changes the vol * of electrical current

Compass - A tmi used to show direction. It has NORTH, SOUTH, WEST and EAST

 


Summary

Stars and Constellations

STARS are made up Of hot gases

stars give off LIGHT and HEAT

The only star you can SEE in the day is the SUN. The Sun is the CLOSEST star to the Earth , that is why it looks bigger and brighter

The Sun is 150 million km from the Earth Stars have different colors. Why ? Because of it's Temperature

HOT stars- White and Blue

Stars - Red and orange

A light year is the distance light travels in one year

Stars are found in LARGE groups called GALAXIES

ANDROMEDA Galaxy is shaped like a spiral

A Milky way has billions Of Other stars

CONSTELLATIONS- A group of stars that make a pattern or shape or design in the sky

people named constellation by what picture they saw in the sky

Today , there are 88 constellations Constellations can used to find direction at night Star charts and help you to each Star

The Sun is made up Of GAS. The Sun is a big The Sun gives light and heat

NEVER direct * into the Sun. It can damage your eyes

Always wear Sunscreen to protect your skin

DRACO
 

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