Revision Sheet grade 4

Transcription

1 Revision Sheet grade 4 Materials for the final exam grade 4 : 1- Science book (pages 484 to 528). 2- The final revision sheet and the copy book. 3- The science booklet. Prepared by: Miss Tamara Al. Majali And Mr, Ali Chabrak

2 All charged up: Electric charge is the property of a particles that affects how it behaves around other particles. atom mostly Protons and neutrons are found in a region of the called nucleus Electrons are found in aregion of empty space called electron cloud. Atoms sometimes gain or lose electrons, if a neutral atom gain an electron, the atom will have a charge of (-1), if a neutral atom loses an electron, the atom will have a charge of (+1) Particles with the same charge Repel Or push away from, one another. Particles with opposite charges attract one another, or pull together. l Lighting: *Why does the electrostatic discharge happen in a rainy day? During a thunderstorms, tiny raindrops or ice particles bump into each other, these collisions cause an electric charge to build in the clouds Positive charges form at the top of a cloud and on the ground Negative charges form near the bottom of a cloud, when the difference in charge between a cloud and the ground is great enough, there is a huge electrostatic discharge that we call lighting.

3 Describe the motion that occurs during electrostatic discharge?. Conductors and Insulators: * A.. is a material that allows electricity to flow through it. * An is a material that electricity cannot flow through. *conductors or insulators? rubber band, penny, woody spoon,key,wood,glass plastic, iron Good conductor Good insulator Series and Parallel Circuits : *In a.. Electricity has only one path to follow. All parts are connected one after another. Electrons flow from the.. of the battery around in a loop to the side.

4 Draw arrows to show the path of the electricity in this series circuit If a light bulb is missing or broken in a series circuit, will the other bulb light? Explain. Parallel circuits: *In a, electricity has more than one path to follow, Electrons can follow different paths as they flow from the side of the battery to the Side. Draw a parallel circuit and put the components of it then answer the question. If a light bulb is missing or broken in a parallel circuit, will the other bulb light? Explain.

5 Magnets and Magnetism: Circle the right answers : Which term means to pull together? a. repel b. attract c. radiant Which term means to push apart? a. repel b. attract All magnets have 2 of these. a. sides b. poles c. sounds Magnets attract materials made of and... a. iron and cooper b. iron and paper c. wood and iron A region of magnetic force surrounding a magnet is a/an a. insulator b. conductor c. magnetic field A washing machine is an example of transforming a. electricity into motion energy. b. motion energy into electric energy. c. electricity into light.

6 When a north pole and a north pole of a magnet come together the magnets are attracted to each other. a. True b. False All magnets have a a. north and west pole b. north and south pole c. south and west pole Electro magnets : Answer the following question: 1. Which parts are needed to make and operate an electromagnets : Generating electricity: Match each term in a column (A) with its meaning on the column (B): column( A) column ( B) 1- it s the charges that a- Electrical charge builds up on an objects 2- it s an one of the atom b- Electromagnet particles and has no charge. 3- it s a physical property c- Neutron that describe the kinds of charge 4- it s a device use the electrical current to generate a d- The generator magnet 5- it s a device that change the mechanical energy to e- Static electricity electrical energy.

7 Unscrambled the scrambled word and give the right word you have : 1.(G A N E T M) the word is. The sentence : 2.(I C T T A S) the word is. The sentence : 3.(C N T R R U) the word is. The sentence : 4.(L U B B) the word is. The sentence : 5.(O T A M) the word is. The sentence :

8 Complete the following graphic organizer : Generating stations Generating stations use a Generating stations use a Natural resources like : Natural resources like : classify the following objects to ( insulators and conductors ) : Wood plastic wooden spoon metal spoon copper wire. insulators Conductors

9 EMIRATES FALCON PRIVATE SCHOOL THE GRADE 4 SCIENCE BOOKLET SECOND SEMESTER

10 Lesson 1 ; charged it up : Define the following terms : 1- The atom:.. 2- The electric charge : What are the different kinds of the charges, name them and give the right charge for each one of them :

11 Draw an atom and identify the different parts of its :

12 Lesson 2 : opposite direction : What s happens for the different electrics charges when they interact? What is the meaning of the static electricity? What is the meaning of the electrostatic discharge? Complete the cause and effect graph organizer below :

13 What is the meaning of the electric current? What is the meaning of the insulator? Identify some useful ways to use the electric currents?

14 Identify some resources of the electric current? What does energy stations do?

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18 Lesson 4 : its shocking: What is the differences between the insulator and conductors? What is the meaning of the circuit?..

19 Identify the main two kinds of the circuits? What is the difference between the parallel circuits and series circuits?

20 .. What is the unit that measure the strength of the following charges?

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22 Identify the meaning of the electric motor? Where we can use the electrical motor?...

23 What is the meaning of the magnets? What is the meaning of the magnetism? What is the meaning of the magnetic field? What are the main two parts of the magnets? Draw and colour a magnet :

24 Identify some ways we can generate the electricity by using it? Choose the correct answer : 1- A proton has a positive charge. What is the charge of a particle that is attracted to a proton? negative neutral positive repulsive 2- Suppose you rub a plastic object on a piece of fur, causing static electricity to form on both objects. The fur now has a positive charge. What happened to the plastic object? It lost protons. It lost electrons. It gained protons. It gained electrons. 3- The pictures below show objects that are charged and objects that are not charged. Which shows two objects with the same charge?

25 4- Look at the picture, How could Shamsa cause the balloons to attract one another and stick together? Give them both a negative charge. Give them both a positive charge. Give only one of them a positive or negative charge. 5- What would happen to the light bulb if Hamad changed the switch from closed to open? It would be duller. It would be brighter. It would stop glowing. It would start glowing. 6- The electric circuit below consists of a battery, a switch, and three light bulbs. What type of circuit is shown in the diagram? closed circuit series circuit magnetic circuit parallel circuit

26 7- Why must the plastic be removed before this wire is used in an electric circuit? so the wire can be bent and fit into the circuit to prevent the circuit from becoming overloaded because the plastic makes the wire too thick to use in a circuit so that electric current can pass between the copper wire and other parts of the circuit 8- Some materials do not conduct electric current. Which of these materials is an electrical insulator? CD case paper clip penny staple 9- A light bulb converts electrical energy into which of the following? light only heat only heat and light light and motion 10- Which of these generating stations uses a renewable source of energy? coal plant nuclear power plant natural gas generator hydroelectric generator This is the end of the science booklet, wish you all the best and good luck in the exam