This is a Clilstore unit. You can link all words to dictionaries.

MECHANISMS. LESSON 1. SIMPLE MACHINES

After watching the video, answer the following questions in your notebook:
 
1. Relate all the mechanisms that appear in this video.

2. Try to explain with your words what “mechanical adavantage is”. Later, investigate and find out the definition.

3. Write your opinion about he type of lessons explained in the video.
 
TRANSCRIPTION
 
0:00
hello my name is appreciated today let's
0:06
share with you an activity that I use
0:08
with my students in our study of
0:09
compound machines now we study the wheel
0:11
and axles we study toys we study beavers
0:14
inclined plane screws wedges but I want
0:17
my students to understand how these
0:18
simple machines function together as a
0:21
compound machine so I've collected all
0:23
these pieces and I ask my students to
0:25
take a look at them and identify the
0:27
simple machines and how they function
0:29
together so let's take a closer look
0:30
students have to pick six examples out
0:33
of my collection of toys and tools they
0:36
examine them one at a time identify the
0:38
simple machines on it calculate
0:40
mechanical advantage and see how the
0:42
effort transfers from one part to
0:44
another for example this bolt cutter can
0:47
slice through a quarter inch bolt with
0:48
very little effort now closer inspection
0:53
we can identify that the resistance for
0:56
this longer arm is attached to this
0:57
shorter lever which will then push those
1:00
wedges through any metal bar when I grip
1:05
this hammer it's actually an extension
1:06
of my arm and I can use it as a third
1:08
class lever to drive in a nail now if I
1:11
want to pull that nail out I simply turn
1:13
the hammer around and now I'm using it
1:15
as a first class lever and if I want to
1:17
create a mechanical advantage I simply
1:19
slide a piece of wood under the head and
1:21
now it's going to make it easier to pull
1:22
this Bell is annoying but it also has a
1:27
first-class lever in it we take it
1:29
apart here I push down on this knob we
1:33
can see the hammer going up to strike
1:34
the Bell and here we can see the effort
1:37
are as part of this assignment students
1:42
will have to make measurements in order
1:43
to figure out the actual mechanical
1:45
here's an antique car jack which uses a
1:52
leaper wheel and axle and a screw and it
1:55
multiplies its mechanical advantages
1:57
together this can opener is probably not
2:00
too easy when your hands in a cast this
2:04
is a game called mousetrap it's actually
2:06
a series of simple machines acting as a
2:09
Rube Goldberg machine in some cases we
2:17
use just one piece as a demonstration
2:19
for example this pulley set okay the
2:24
apple core is also very popular we bring
2:27
in a couple apples and slice them up and
2:28
then everybody gets a piece
2:36
Oh keep going oh I'll get a slice oh boy
2:42
ok ok oh yeah it is i washed it hey
2:53
there's our appeal now the last part of
2:57
our investigation is something I like to
2:58
call the invention convention in this
3:01
case I'm asking my students to build a
3:02
device either a simple machine or
3:04
compound machine that perform some type
3:06
of chance it could be swatting a fly it
3:09
could be a series of levers it can be
3:12
any number of things and we're going to
3:14
take a closer look at these in a later
3:16
video
3:31
you

 

Short url:   http://multidict.net/cs/5084