Swimming Lessons

Desperately waiting for the lunchtime bell. I raced back to our class to get my swimming shorts. Nervously tying my shoelaces I stood up and pranced into the line. “Hurry!” I shouted. Without delay, I trudged to the aquatic centre. When we got to the pools, I was very nervous and shy. My palms were sweaty, my hands were shaking and my stomach was churning. “Remember, we are not here by ourselves, this is a public pool so remember to not be silly. Plus we are here to have swimming lessons not to muck around.” reported Mrs Nua.

Walking into the pools, I smelt the chlorine/chemicals. Hastily walking into the changing rooms, I saw a lot of people paddling, back stroking, freestyling. When I got into the changing rooms, I promptly put on my swimming shorts. Without hesitation I carefully sprinted out of the changing rooms. Strolling on the slippery surface I get into the piercing water for three seconds. I rapidly went out of the biting water and sat on the green hard bench.

When I sat down, our instructor ‘Jackie’, was waiting for the rest of us. Just then everyone came, our instructor Jackie was  going to test our swimming progress. I was one of the first ones to swim. We had to swim with the boards. Most of us were not good with boards. In the end, Jackie put us in our groups. I was in group 2, but then Jackie said “There are too many in group 2”. So, Jackie moved four or five people into group 1 including myself

At the end, group 1 went into their pool and group 2 had to stay. Our instructor was Mrs Nua and group 2 was Jackie. In the end we went back to the changing rooms and got into our school uniform. Once we were all finished, we ran back to school in the biting slammering rain.

Breaking The Sound Barrier, Reading Activity

http://www.scientificamerican.com/article/what-happens-when-an-airc/   (simplified)

What happens when an aircraft breaks the sound barrier?

Mar 11, 2002.

What happens when an object breaks the sound barrier must begin with the description of sound as a wave.  Anyone who has heard an echo (sound waves reflecting off a distant surface) or been far enough away from an event to see it first and then hear it, is familiar with the reasonably slow travel of sound waves. At sea level and temperatures of 22 degrees Celsius, sound waves travel at 345 meters per second. As the temperature decreases, the sound speed also decreases, so for a plane flying at 35,000 feet (10688 metres) where the temperature is  around -55 degrees Celsius, the speed of sound is 295 meters per second.

When the sources of a sound is moving it can begin to catch up with the sound waves they emit. As the speed of the object increases to the speed or velocity of sound waves, these sound waves begin to pile up in front of the object. If the object has sufficient acceleration, it can burst through this barrier of sound waves and move ahead of the sound it is making. As the object outruns all the pressure and sound waves in front of it, it is heard on the ground as an explosion, or sonic boom.

At supersonic speeds (those greater than the speed of sound), there is no sound heard as an object approaches an observer because the object is traveling faster than the sound it produces. Only after the object has passed will the observer be able to hear the sound waves emitted from the object.

Aircraft wings create low-pressure regions. Under sonic flight conditions the lowered pressure condenses the water in the air, creating a vapour cloud. Just as the aircraft bursts through the barrier, the air is locally disturbed by the resulting shock wave and the condensation/vapour cloud disappears.

Explain how there can be slight variation in the speed of sound?

When its hot, the sound travels faster about 345 meters per second. But when its cold like -55 degrees celsius the sound travels slower at 295 meters per second.

What is an echo?

sound waves reflecting off a distant surface

What happens to the sound waves, when the object making the sound is moving?

When the sources of a sound is moving it can begin to catch up with the sound waves they emit

Why is there no sound heard as an object approaches if it is going at supersonic speed?

Because the object is travelling faster than the sound it is producing.

What does supersonic mean?

Supersonic is involving or denoting a speed greater than that of sound.

Why does a person travelling in a car with the horn sounding only hear one pitch whereas someone listening to the car drive past and hears the pitch change as they drive past?

The sound waves changes pitch when the object is moving the sound waves.

What does decrease mean? Make or become smaller or fewer in size, amount, intensity, or degree. An example of decrease is to make it less.

Sufficient? Enough; adequate. An example of sufficient is, If the object has sufficient acceleration, it can burst through this barrier of sound waves and move ahead of the sound it is making.

Emit? Let go, an example of emit is when you shake the soda bottle and then when you open the cap, all of the fizzy explodes out.

Velocity? The speed of something in a given directions. Example- The velocity of the car caused the girls hair to fly.

Condense? Make something more denser or more concentrated. Example for condense is when you are focusing or concentrating on that one thing.

acceleration? Increase in speed or rate. Another example for acceleration, If you are driving to an emergency then you would accelerate there.

Prepare Synonyms And Antonyms

Decimals And Place Value

Thinkboard Warmup

Triangle Decimals

Nervous, Synonym And Antonym

Solve Subtraction Problems With Hundredths By Changing The Second Number Into A Whole Number.

Alphabet Addition

Thinkboard Week 7

Word Web- Cold

Presentation Week 6

Alphabet Multiplication

Addition Probems With Tenths By Changing One Number Into A Whole Number, Presentation. Week 6

Consolidation Week 6

Last week, Maya and Gabriela decided to see how fast they could sprint 400 meters. They asked their friend Jessica to time them with a stopwatch. After 4.72 minutes, Jessica agreed to time the runners. Maya sprinted first and ran 400 meters in 76.39 seconds. When it was Gabriela's turn, she sped off and completed the run in 72.69 seconds. How much faster was Gabriela than Maya in seconds? Gabriela beat Maya by 3.7 seconds. Answer-3.7 seconds

5.3+4.7=10

-0.3 +0.3

5+5=10

5.31+4.77=10.28

-0.03 +0.03

5.28+4.8=10.28

5.31+0.477=

0.31+0.47=0.78

5.00+0.78+0.0700=5.78700

53.1−47.8 = 100.9

-0.1    +0.1

53-47.9=100.

5.31−4.78 = 0.59

-0.01  +0.01

5.30-4.79=0.59

5.31−0.478 = 5.78800

Thinkboard Week 6

Consolidation Week 5 Maths

You need to use 2 different strategies to answer the following questions:

193 - 35 = 158

Rounding And Compensate.

Subtract 3 from 193 which equals 190.

Subtract 3 from 35 which equals 32

190-32=158

Number Line

     _-3_________-30______-2____

193 190 160       158

215 - 67 = 148

Subtract 5 from 215 which equals 210

Subtract 5 from 67 which equals 62

210-62=148

    __-5______-10________-50_______-2_

215 210 200     150 148

315 - 73 = 242

Subtract 5 from 315 which equals 310

Subtract 5 from 73 which equals 68

310-68=242

    ___-5____-10_____-60_____________

315  310   300        240

62 x 5 = 310

5*60=300

2*5=10

300+10=310

Half the 62 which makes 31

31*5=155

31*5=155

155+155=310

92 x 6 =540

6*90=540

6*2=12

540+12=552

Half the 92 which makes 46

46*6=276

46*6=276

276+276=540

5.0 - 2.65=2.35

+0.05 +0.05

5.05-2.7=2.35

5-2=3

3-0.65=2.35

7.75 - 4.21 =3.54

-0.1  -0.1

7.74-4.2=3.54

7-4=3

0.75-0.21=0.54

3+0.54=3.54

6.0 - 2.79 =4.79  

+0.1  +0.1

6.01-2.8=4.79

6-2=4

0.00-0.79=0.79

4+0.79=4.79

6.0 - 2.06 =3.94

+0.04 +0.04

6.04-2.1=3.94

6-2=4

0.0-0.06=0.06

4-0.06=3.94

Use two different strategies to answer the following questions:

There are 42 ladybugs on six leaves. How many ladybugs are on each leaf? 7

Split the 42 into 30 and 12.

30/6=5

12/6=2

5+2=7

21/6=3.5

21/6=3.5

3.5+3.5=7

To fill one jug it takes 4 litres. How many jugs can I fill with 28 litres?

Split 24 into 16 and 12.

16/4=4

12/4=3

4+3=7

14/4=3.5

14/4=3.5

3.5+3.5=7

To fill a bucket is takes 9 litres. How many buckets can I fill with 63 litres?

Split the 63 into 54 and 9.

54/9=6

9/9=1

6+1=7

31.5/9=3.5

31.5/9=3.5

3.5+3.5=7

I have 56 lollies I have to share with seven people. How many lollies will each person receive?

Split 56 into 49 and 7.

49/7=7

7/7=1

7+1=8

28/7=4

28/7=4

4+4=8

I have 36 lollipops, 1/ 4 of them are strawberry flavour. How many strawberry flavoured lollipops do I have?

36/4=9

9*1=9

Answer: 9

There are 168 children at Ruapotaka school and only 74 at Sommerville. How many students are there combined at the two schools? Use two strategies to work these questions.

168+74=246

166+72 I subtracted the 2 onto the 168 and 74 which equaled 166 and 72.

166+72=246.

160 and 8. Makes 168.

160+74=238

238+8=246

I had 42 lollies I had to share with 7 people. How many lollies does each person get?

Use two strategies to work these questions.

42÷7=6

Split 42 into 35 and 7.

35÷7=5

7÷7=1

5+1=6.

21÷7=3

21÷7=3

3+3=6

Miss Clark had a cake she cut in half. She then cut each of those pieces in half. How many pieces of cake are there? What would you call each piece of cake? Use two strategies to work these questions.

Miss Clark had a full cake. Then she cut it in half which there 2 pieces of cake now. Then she cut those pieces in half which now it makes 4. Answer: 4

I had $237, I went shopping and spent $69. How much money do I have left? Use two strategies to work these questions.

237-69=168

+1    +1

238-70=168

____-7________+60______________________-2___________

237    230       170 168

Six friends eat four cakes, what fraction of the cake do each of them get? Use two strategies to work these questions.

They each got 2 cakes. And one person eats their by their selves.

2 Friends each have 1 cake.

Now there’s 3 cakes left over.

2 Friends have each 1 cake.

There’s 2 cakes left over

1 friend haves 1 cake all to their self

Twelve friends eat four cakes, what fraction of the cake do each of them get? Use two strategies to work these questions.

They each have 1/3 of the cake.

3 Friends have 1 cake.

To fill my car tank, it takes 60 litres. Each litre costs 2.07cents. How much would it cost me to fill my tank?  Use two strategies to work these questions.

It took 29 cents to fill up 60 litres.

2.07*29=60.03

It took Mosa, 4 minutes to iron 8 pairs of socks. How long does it take him to iron one sock only?

It would take 2 minutes.

8  1

*2___________________*2

4  2

It took me, 10 minutes to iron 30 pairs of socks. How long does me to iron one sock only?

It would take 3 minutes

30  1

*3_____________________________*3

30  3

Thursday:

Use the following strategies to answer the questions below

Strategy making hundreds

153 - 89 =64

153 - 100 = 53

53 + 11 = 64

322 - 57 = 180

322-100=222

222-42=180

162 - 86 =48

162-100=62

62-14=48

218 - 39 =57

218-100=118

118-61=57

Rounding and compensating

133 - 89 =44

133 - 90 I added one to 89 to  make it 90.

133 - 90 = 43 + 1 = 44

320 - 57 =263

320-60 I added one 3 to 57 to make it 60.

320-60=260+3=263

124 - 86 =38

128-90 I added 4 to 86 to make it 90.

128-90=38

283 - 39 =

283 - 40 I added 1 to 39 to make it 40.

283-40=244

Equal addition

153 - 95 =58

158 - 100 = 58

Answer-58

322 - 75 =247

300-75=247

Answer-247

162 - 66 =96

160-66=96

218 - 92 =

Partitioning

153 - 95 =58

100 - 90 = 10

53 - 5 = 48

10 + 48 = 58

322 - 72 =248

300-70=230

20-2=18

230+18=248

162 - 76 =84

100-70=30

60-6=54

30+54=84

218 - 92 =118

200-90=110

10-2=8

110+8=118