Year 3 Science Magnets: check-up and practice test questions

Method. Read the word table in section 10.1.

1. Read the table. The table says that repel means push away from each other.
   repel
2. Write the answer.
   repel

Check. Attract means pull towards each other. ✓

Method. Read the key idea in section 10.2.

1. Read the key idea. Steel is a magnetic material, so a magnet attracts it.
   steel
2. Write the answer.
   steel

Check. Plastic is a non-magnetic material. ✓

Method. Look at the table in section 10.2.

1. Find copper. The copper wire row says that the magnet does not attract it.
   no
2. Write the answer.
   no

Check. Copper is a metal, but it is not magnetic. ✓

Method. Read the key idea in section 10.4.

1. Read the key idea. A bar magnet has two poles, one at each end.
   poles
2. Write the answer.
   poles

Check. The poles are at the two ends. ✓

Method. Read the key idea in section 10.5.

1. Name the poles. Two south poles are like poles.
   like poles
2. Use the rule. Like poles repel.
   repel
3. Write the answer.
   repel

Check. Like poles push apart. ✓

Method. Read the key idea in section 10.5.

1. Name the poles. A north pole and a south pole are unlike poles.
   unlike poles
2. Use the rule. Unlike poles attract.
   attract
3. Write the answer.
   attract

Check. Unlike poles pull together. ✓

Method. Read the two bars.

1. Read the bars. The bar for Magnet A is 5 clips, and the bar for Magnet B is 9 clips.
   5 and 9
2. Choose the taller bar. The taller bar is Magnet B.
   Magnet B
3. Write the answer.
   Magnet B

Check. Nine is more than five. ✓

Method. Read the key idea in section 10.2.

1. Read the list. Iron, steel and nickel are magnetic materials.
   iron, steel and nickel
2. Write two of them. Any two of these is correct.
   two materials
3. Write the answer.
   Accept any two of: iron, steel, nickel.

Check. Each of these is attracted by a magnet. ✓

Method. Think about what makes a test fair.

1. Think about the test. Only the magnet should change.
   only the magnet
2. Write one thing. For example, use the same tray each time.
   same tray
3. Write the answer.
   Accept any one of: the same paper clips; the same tray; the same end of each magnet; the same way of lifting.

Check. Keep everything else the same. ✓

Method. Think about each object.

1. Think about the paper clip. Steel is a magnetic material, so the magnet attracts the paper clip.
   attracts
2. Think about the rubber band. Rubber is a non-magnetic material, so the magnet does not attract it.
   does not attract
3. Write the answer.
   Accept any sentence that says the steel paper clip is a magnetic material, but the rubber band is not magnetic.

Check. Magnetic materials are attracted, and non-magnetic materials are not. ✓

Method. Think about what the magnets do.

1. Read the sentence. The magnets snap together, so they pull towards each other.
   pull together
2. Name the word. Pulling towards each other is attract.
   attract
3. Write the answer.
   attract

Check. Repel would mean push apart. ✓

Method. Read the key idea about magnetic materials.

1. Read the key idea. A material that a magnet does not attract is a non-magnetic material.
   non-magnetic material
2. Write the answer.
   non-magnetic material

Check. Wood and plastic are non-magnetic materials. ✓

Method. Think about which objects are magnetic.

1. Check each object. Steel is a magnetic material. Aluminium and rubber are not.
   steel
2. Write the two objects. So the magnet attracts the steel paper clip and the steel nail.
   steel paper clip and steel nail
3. Write the answer.
   Steel paper clip and steel nail

Check. The foil ball and the rubber band are not attracted. ✓

Method. Think about the ends of a bar magnet.

1. Think about the ends. A bar magnet has one pole at each end.
   one at each end
2. Count the poles. So it has two poles.
   2
3. Write the answer.
   2

Check. Two poles, one at each end. ✓

Method. Think about the north poles.

1. Name the poles. Two north poles facing each other are like poles.
   like poles
2. Use the rule. Like poles repel, so the magnets push apart.
   repel
3. Write the answer.
   repel; like poles

Check. Like poles repel, and two north poles are the same kind. ✓

Method. Think about the two poles.

1. Name the poles. A north pole and a south pole are unlike poles.
   unlike poles
2. Use the rule. Unlike poles attract.
   attract
3. Write the answer.
   attract

Check. Unlike poles pull together. ✓

Method. Check each object.

1. Check the steel nail. The steel nail is a magnetic material, so the magnet attracts it.
   attracted
2. Check the other two. The plastic lolly stick and the copper wire are not attracted.
   not attracted
3. Explain copper. Copper is a metal, but it is not a magnetic material, so a magnet does not attract it.
   not magnetic
4. Write the answer.
   Plastic lolly stick and copper wire. Accept any sentence that says copper is not a magnetic material, so a magnet does not attract it.

Check. Only magnetic materials are attracted by a magnet. ✓

Method. Add the three trials, then divide by three.

1. Add the trials. Seven, five and six add up to eighteen.
   7 + 5 + 6 = 18
2. Divide by three. Divide 18 by 3 to get the average.
   18 divided by 3 is 6
3. Write the answer.
   6

Check. Check: 6 + 6 + 6 = 18. ✓

Watch out. Divide by the number of trials, which is three.

Method. Think about what makes a test fair.

1. Think about the test. Only the magnet should change in a fair test.
   only the magnet
2. Write one thing. For example, use the same tray each time.
   same tray
3. Write the answer.
   Accept any one of: the same tray; the same number of clips; the same end of each magnet; the same way of lifting.

Check. Keep everything else the same. ✓

Method. Think about each object.

1. Think about the paper clip. Steel is a magnetic material, so a magnet attracts a steel paper clip.
   attracts
2. Think about the ruler. Plastic is a non-magnetic material, so a magnet does not attract a plastic ruler.
   does not attract
3. Decide. So Ruby is not right about the ruler.
   no
4. Write the answer.
   No. Accept any sentence that says plastic is not a magnetic material, so a magnet does not attract a plastic ruler.

Check. Ruby is right about the paper clip, but not about the ruler. ✓