|
CRANES
Introduce
the concept of cranes, and what keeps them structurally sound, and
in balance.
| MATERIALS
REQUIRED PER STUDENT GROUP |
| 22
Squares |
24
Square Frames |
6
Cogs |
| 13
Triangles |
8
Triangle Frames |
1
Handle |
| 5
Red Cylinders |
110
Connectors |
13
Blue Connectors |
| 2
White Cylinder Connectors |
String
- about 2 feet (60 cm) |
EXERCISE
1
 Build
the model illustrated. Note the use of the blue connectors for the
framework at the top holding the 'pulleys'. You need the extra width
provided by the blue connectors to fit the 'pulley' inside the frame.
The string is fed over the top pulleys, down through the tower,
and out the back through the center hole in the square at the rear
of the base, and then up onto the rear pulley with the handle. The
base for the rear pulley stand separate from the crane tower. Experiment
with weights, and identify the points where pressure is exerted.
EXERCISE
2
Now try varying the shape of the crane, and again test it with weights,
and note the differences for each model.
A.
Make the base shorter.
B.
Revert to the original base and make the gantry (top) longer.
C.
Make the tower shorter.
D
Extend the gantry out the rear and put a counter weight on it.
[Klikko
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