Welcome Engineers !
We are beginning our new unit! We will study the materials and designs used in construction tasks. We will compare paper, clay, cardboard, Styrofoam or other available materials to see which are the strongest—which ones resist bending, crushing or tearing—and which are most easily shaped and joined. We will test different shapes and thicknesses to find out what makes a structure strong and stable and to find out how much material is needed. Throughout the topic, you will learn that many things are considered when materials and designs are selected and that different tasks may require different materials and designs.
Let's get started !!!
Let's get started !!!
grade_3_topic_b_smart_notes_pdf.pdf | |
File Size: | 3514 kb |
File Type: |
https://docs.google.com/presentation/d/1DXfF9nS1T_EDgMuQ19zfcITFmEzTLD5H2QL2rZl0gk0/edit?usp=sharing
Vocabulary
Adhere: A material used to stick or adhere. Glue and tape are adhesives.
Beam: A main horizontal piece of steel, wood or concrete used to support mass. Box Girder: A hollow beam designed to be light weight and strong. Engineer: an engineer is someone who studies the characteristics of the materials and chooses the one best suited for the construction task. Fair test: a fair test is a test where the factors (variables) are controlled by the scientist in order to keep testing the same (constant). If changes are made, it can only be to one variable. Foundation: The supporting base or lowest part of a structure often extending underground. Girder: A beam shaped to be light weight and strong. E.g. the I-beam. Hypothesis means: an educated guess about what will happen and why. Usually “I think…because…”. I-Beam: A beam designed to be light weight and strong. The end of the I-beam. http://asd-n.nbed.nb.ca/files/documents/grade_3_-_materials_and_structures_-_curriclum_lesson_guides.pdf |
Hardness - Resistance to scratching and pressure. Hardwood does not mark as easily as softwood.
Strength - Amount of force needed to break a material usually by pushing or pulling down. Toughness - Resistance to breaking by cracking, opposite to ‘brittle’. Stiffness - Amount of force needed to change the shape of a material,opposite to flexible. Elasticity - Ability to return its original shape when a force is removed. Like a rubber band. Plasticity - Ability to retain the new shape when a force is removed. Eg. - plasticene. Absorbency - Ability of a material to soak up a liquid. Waterproof - Resistance to liquids, repels water. |