- The strength of a structure depends on its size and geometric shape as well as material composition
- Structures react to loading by a force by lengthening, being compressed, or bending
- If a load is too large, the structure may fail
The purpose of these exercises is to get the kids thinking about how size, geometry and material type can affect the strenth of a material under loading. The third graders do study matter and material. Below is the text associated with the third grade standards relating to matter:
- infer that objects are made of one or more materials based on observations of the physical properties that are common to each individual object.
- compare the physical properties of smaller pieces of a material to those physical properties of the entire material.
- conclude that materials have their own set of physical properties that are observable.
- explain that physical properties are observable characteristics that enable one to differentiate objects.
- design an investigation to determine if the physical properties of a material will remain the same if the material is reduced in size.