FORCES AND MOTION

 PUSHES AND PULLS
             
                            

WHAT ARE PUSHES AND PULLS?

We are surrounded with forces everywhere we go and in almost everything that we do. Gravity is a force that keeps us on the earth. Friction is a force that heats things up. This happens when we rub our hands together and the heat that is generated from the friction makes our hands warmer. Pushing and pulling is making use of another force as well as pressure, which is force applied by an amount of weight.

An Example of push as a force would be to push on a swing. The force moves the swing in a particular direction and the harder that you push the further the swing will go.

An example of pull as a force would be opening a door. If you pull on it lightly, the door won’t open, but if you pull with greater strength, the door opens enough. If you pull the door too hard it will slam into the wall.

Any kind or type of force actually breaks down to being just a pull or push.

Another type of force is magnetism that may pull an object toward it or push it away, depending upon the polar fields.

 Inertia is not considered a type of force. Anything that has mass or weight will automatically slow down due to the weight. This is inertia. Objects that are larger have more inertia and with increased inertia, the greater the force that is needed to make it move. An example might be to compare a caterpillar with an elephant. The elephant has more inertia.

 Elastic and springs are also types of force. When you push against them they will resist however they will spring back with the same amount of force that you inserted on them.

WHAT IS A FORCE?

 

                                                                                                                                                         

WHAT ARE THE EFFECTS OF FORCE?

 The world and the Universe are action-packed. People and animals are always on the move. The planets are constantly circling the Sun. Are there any rules to all this activity? Yes! Our world and the whole Universe are governed by the laws of nature. Scientists who try to understand and learn about these laws are called physicists. Here are some questions that physicists across history have wondered about: When you drop a ball, why does it fall on the ground? Why doesn’t it float up? If you spin a top, why doesn’t it spin forever? Why does it eventually stop? Maybe you have wondered about these things, too.

To answer those questions, physicists needed to discover the laws of motion. What is motion? Motion is movement in any direction. You can move up, down, forwards, backwards, and sideways. You can move in circles. You can wiggle, wave, twist, turn, roll, flip, sway, bend, pivot, shake, and spin.

http://www.bbc.co.uk/schools/scienceclips/ages/5_6/pushes_pulls.shtml

FRICTION

                                          

Friction is a special kind of force. But what's a force? Forces are pushes or pulls that can change the motion, or movement, of objects. If you pushed or pulled a box of books across the floor, you would be using force to move the box. But there are other forces affecting that box of books besides your pushes or pulls.

Let's say you're trying to push that box from one end of your bedroom to the other end. As you push it, the box will move, but there's also a force acting in the opposite direction of your push.

This force, called friction, will stop the box from moving when you stop pushing it.

More or less force can be produced depending on the  surface of the objects.

If the surface is smooth, less friction will be.

If the surface is rought more friction will be acting on the objects. 

 watch the video about friction!!!

FORCEMETER

  


HOW TO USE A FORCEMETER

SCIENCE EXPERIMENT ABOUT FORCE AND MOTION

https://www.youtube.com/watch?v=ILhckx1zGXw
https://www.youtube.com/watch?v=_LdcxCdB-s8

PRACTICE FOR SECOND PERIOD EXAM

study guide

GUIA DE ESTUDIO 
                                                                         

         study guide

MATERIALS

Materials 

Material properties

Print

Materials have different properties that make them useful for different jobs. Here are some properties that materials have.

Transparent or opaque

Transparent materials do let light through (you can see through them). Opaque materials do not let any light through (you cannot see through them).

Waterproof

Waterproof materials do not let water through and do not soak up water.

Absorbant

Absorbent materials soak up water and let water pass through them.

Strong or weak

Strong materials are very difficult to break. Weak materials break easily.

Flexible

Flexible materials are easy to bend.

Rigid

Rigid materials are difficult to bend.

Hard

Hard materials are difficult to scratch.

Magnetic

Magnetic materials are attracted to magnets.

Conductors

Some materials are good conductors of heat. This means heat can travel through them easily.
Some materials are good conductors of electricity. This means electricity can travel through them easily.

Insulators

Some materials are insulators of heat. This means they do not allow heat to travel through them very easily. Some materials are insulators of electricity. This means that electricity cannot travel through them.

Metals

Metals come from rocks called ores.

They are strong, hard and shiny materials that can be hammered into different shapes without breaking.

Many metals are good conductors of heat and electricity.

Some metals are magnetic. Iron is the most magnetic metal. Steel is also magnetic because it is made of mostly iron.

Their properties make them useful for objects such as cutlery, saucepans, cars and coins.

Plastics

Plastics are materials made from chemicals and are not found in nature. They are strong and waterproof, and can be made into any shape by applying heat. Plastics can also be dyed different colours or made to betransparent.

Plastic is not magnetic. It is a good electrical insulator as it does not conduct heat or electricity.

Plastics are used to make all sorts of things, such as bags, bottles and toys.

Glass

Print

Glass is made by melting sand and other minerals together at very high temperatures.

Glass is normally transparent and can be made into many different shapes. Thick glass can be strong, but thin glass will break very easily.

Glass is used for objects that need to be transparent such as windows and spectacles.

Wood

Wood comes from trees.

It is strong, flexible and long lasting.

Wood is used to make things such as furniture that need to be strong and last a long time.

Wood is an insulator of heat and electricity.

Fabrics

P

Fabrics are made from thin fibres woven together.

• Some fabrics, such as wool, cotton and silk, are natural (the fibres come from living things).
• Some fabrics, such as polyester and nylons are made from synthetic fibres, which are made in factories, from chemicals.

Different fabrics have different properties. Fabrics can be stretchy (a pair of tights),insulating (keep you warm, like a woollen coat) or absorbent (a towel).

Fabrics are used to make clothes as they are flexible and comfortable, can be warm and do not wear out easily.

ONLINE GAMES 

ONLINE GAME

LINKS--

https://www.youtube.com/watch?v=xOKr462HLc0 materials

https://www.youtube.com/watch?v=lK6C-XjD_dQ materials song

https://www.youtube.com/watch?v=TzR9fXL-Obo properties of materials

https://www.youtube.com/watch?v=7IP0Ch1Va44 how paper is made from Wood https://www.youtube.com/watch?v=Gq7L9-0XdVw

https://www.youtube.com/watch?v=svvNNpp4CDs cotton production

https://www.youtube.com/watch?v=CKq42J7SaWw How to make rubber

https://www.youtube.com/watch?v=h-sLHYvqT7I rubber glove production

https://www.youtube.com/watch?v=9vbTCeYwt_g leather manufacturing process

URL 5.1:                Video of paper making

http://www.youtube.com/watch?v=jGH7kQ30SKo

URL 5.2:                Video of making pencil holder with wooden craft sticks

http://www.youtube.com/watch?v=CoMJ5vD38dw

URL 5.3:                Video of making photo frame with wooden craft sticks

http://www.youtube.com/watch?v=r9oqVyWTRnA

URL 5.4:                Video of cotton production

http://www.youtube.com/watch?v=svvNNpp4CDs

URL 5.5:                Making rubber (corresponds to Internet Link 5.1 in Textbook)

http://www.youtube.com/watch?v=VIhQi-bgbu8

URL 5.6:                Video of production of rubber gloves

http://www.youtube.com/watch?v=h-sLHYvqT7I

URL 5.7:                Video of leather manufacturing process

http://www.youtube.com/watch?v=usJPfUVqpFo

URL 5.8:                Getting silk from silkworms (corresponds to Internet Link 5.2 in Textbook)

http://www.youtube.com/watch?v=fh295glhogE

URL 5.9:                Video of making silk

http://www.youtube.com/watch?v=IFo3SxqH2-A

URL 5.10:             Video of wool production

               http://www.youtube.com/watch?v=uEYsmzophTA

                

FLOWERING PLANTS

FLOWERING PLANTS

PARTS OF A PLANT

WHAT DO PLANTS NEED TO GROW WELL?

In order to grow, plants need several things.The most important one is warmth. Just like we need the warmth of our parents love, the plants need the warmth of the sun.
Plants need a good supply of water. A very few plants can survive with little or no water, example, the  cactus. Plants need soil to put down their roots firmly and grow. But, how do they grow on rocky mountains then? Well, a few plants that do grow on the rocky mountains find soil in the cracks of the rocks – and that is where they put in the roots. If the soil is too hard it is difficult for the plants to put in their roots. Plants need to grow in places where other plants have died. These old plants get dried, and the wind and rain make a powder out of them. That powder is the plant food! Really!

http://www.sciencekids.co.nz/plants.html
http://www.botanical-online.com/lasplantasangles.htm

photosynthesis

Three things plants need to live 

Plants need three basic things to live: water, sunlight, and carbon dioxide. Plants breathe carbon dioxide just like we breathe oxygen. When plants breathe carbon dioxide in, they breathe out oxygen. Plants are the major source of oxygen on planet Earth and help keep us alive. 

We know now that plants use sunlight as energy, they get water from rain, and they get carbon dioxide from breathing. The process of taking these three key ingredients and making them into food is called photosynthesis. 

How do plants capture sunlight? 

Plants capture sunlight using a compound called chlorophyll. Chlorophyll is green, which is why so many plants appear green. You might think at first that it's green because it wants to absorb and use green light. However, from our study of light, we know that the color we see is actually the color of light that is reflected. So chlorophyll actually reflects green light and absorbs blue and red light. 

More details on Photosynthesis 

Inside a plant's cells are structures called chloroplasts. It's in these structures where the chlorophyll resides. 

There are two main phases to the process of photosynthesis. In the first phase, sunlight is captured by the chloroplasts and the energy is stored in a chemical called ATP. In the second phase, the ATP is used to create sugar and organic compounds. These are the foods plants use to live and grow. 

The first phase of the process must have sunlight, but the second phase can happen without sunlight and even at night. The second phase is called the Calvin Cycle because it was discovered and described by scientist Melvin Calvin. 

Even though plants need sunlight and water to live, different plants need different amounts of each. Some plants need just a little water while others need a lot. Some plants like to be in the direct sunlight all day, while others prefer the shade. Learning about the needs of plants can help you learn where to plant them in your yard and how best to water them so they will flourish. 

SECOND PERIOD

TOPICS FOR SECOND PERIOD

Biology: plants ·         Plant parts ·         What are the functions of different parts of a plant ·         What do plants need to grow well ·         Conditions of a plant to grow. tests Chemistry: Material properties ·         Types of materials ·         What properties do materials have ·         How can materials be sorted based on their properties- describing properties ·         Sorting objects and materials

STUDY GUIDE

 FIRST PERIOD EXAM 

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    STUDY GUIDE 

CLICK HERE

WELCOME

WELCOME TO SCIENCE THIRD GRADE CLASS!!!

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