Introduce the concept of cranes, and what keeps them structurally sound, and in balance.
|MATERIALS REQUIRED PER STUDENT GROUP
||24 Square Frames
||8 Triangle Frames
|5 Red Cylinders
||13 Blue Connectors
|2 White Cylinder Connectors
||String - about 2 feet (60 cm)
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.
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.
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