1
00:00:00,050 --> 00:00:06,769
Let's begin with exercise four at the top of page 103.

2
00:00:08,490 --> 00:00:16,570
In this exercise, you will look around your home and try to find a complex machine.

3
00:00:17,190 --> 00:00:19,530
So we will not be looking in the classroom.

4
00:00:20,129 --> 00:00:26,870
Instead, you will look around your house, maybe in the living room or in the bedroom,

5
00:00:27,670 --> 00:00:36,200
and try to find a complex machine. This might be for example a computer

6
00:00:37,719 --> 00:00:49,329
or maybe even a television that you watch and use for fun activities. Now let's move on to exercise

7
00:00:49,329 --> 00:01:05,299
five. Look and write simple or complex under each machine and tool. You will label under each whether

8
00:01:05,299 --> 00:01:16,019
it is simple or complex. So remember that simple tools only have one or two parts and they do

9
00:01:16,019 --> 00:01:25,780
simple tasks. Complex machines make difficult tasks easier, and they do a lot of different

10
00:01:25,780 --> 00:01:35,219
things and have many different parts. So please write under each picture whether it is simple or

11
00:01:35,219 --> 00:01:46,560
complex. For example, this axe, if you can think and remember, you can recall that

12
00:01:46,560 --> 00:01:58,640
an axe is a wedge, and a wedge is a simple machine. However, a telephone is a

13
00:01:58,640 --> 00:02:05,480
complex machine because there are many different parts inside of the screen

14
00:02:05,480 --> 00:02:12,039
that make it work and because the function of the telephone is much more

15
00:02:12,039 --> 00:02:26,080
complex than a simple machine. Now we will move forward to exercise six. On the

16
00:02:26,080 --> 00:02:34,900
left side we will write three simple machines and on the right side we will

17
00:02:34,900 --> 00:02:42,580
write three complex machines. First, I will read you this box to make it easier to fill

18
00:02:42,580 --> 00:02:52,860
in with the correct machine and its description. A simple machine has a few or no moving parts.

19
00:02:52,860 --> 00:03:00,800
A complex machine is a combination of simple machines, so it has many simple machines inside

20
00:03:00,800 --> 00:03:09,259
of it all together working. A complex machine is a combination of simple machines and has

21
00:03:09,259 --> 00:03:16,340
parts that move. Some complex machines need electricity to work, so you need to plug it

22
00:03:16,340 --> 00:03:23,860
into the wall or you need to put batteries inside for it to work because it needs electricity

23
00:03:23,860 --> 00:03:36,069
and power. So on this side, you will write simple machine at the end of each sentence.

24
00:03:36,069 --> 00:03:44,050
And you will fill in two missing simple machines. So as you can see, we have crossed off lever

25
00:03:44,050 --> 00:03:52,990
because we have our first example. A lever is a simple machine. Now think of the remaining

26
00:03:52,990 --> 00:03:57,710
machines that we have above and write

27
00:03:57,710 --> 00:04:05,469
two more simple machines. A is a simple machine

28
00:04:05,469 --> 00:04:15,439
and A is a simple machine. Then you can cross off above

29
00:04:15,439 --> 00:04:22,319
what you have filled in with the spaces so that you can continue forward on

30
00:04:22,319 --> 00:04:29,680
the right side and it makes it easier to fill in with our complex machines.

31
00:04:29,680 --> 00:04:34,959
Okay, so let me help you with the first example.

32
00:04:34,959 --> 00:04:44,639
Which of these is a complex machine? A computer is a very good example of a

33
00:04:44,639 --> 00:04:48,879
complex machine because there are many moving parts in a

34
00:04:48,879 --> 00:04:54,319
computer and it needs electricity, power,

35
00:04:54,319 --> 00:05:20,560
for it to work. So I will write in this line, a computer is a complex, and you can write below

36
00:05:20,560 --> 00:05:34,009
if you run out of space, machine. A computer is a complex machine. And now I can cross off

37
00:05:34,009 --> 00:05:44,490
computer and fill in the other blank. Complete the sentences with two more examples of complex

38
00:05:44,490 --> 00:05:53,490
machines that you can choose from here. Okay, excellent work class. I'll see you next time. Bye-bye.