Grade 7 Structures And Forces - LA

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Footing

A base that is wider than the wall to help it spread wait over a larger area

Deformation

A change in a structure when the force is acting on it

Torsion

A force that acts on a material by twisting it and in opposite directions

Shearing

A force that bends or tears on a material by pushing parts of it in opposite directions

Tension

A force that pulls the material apart

Friction

A force that resists or work against the movement of 2 surfaces rubbing together

Mobile joint

A joint that is designed to allow movement

Rigid joint

A joint that is designed to fix an object into place and allows no movement

Forces

A push or pull or any type of movement on the structure

Frame structure

A structure in which a skeleton of materials supports the weight of other parts

Metal fatigue

A weaking of metal due to stress what can result in small cracks

Mass structure

A whole bunch of the same material piled up on each other

Manufactured structure

An object or structure made by humans

Natural structure

An object or structure not made by humans

Structure

An object with a definite size and shape that serves a purpose or a function

Shell structure

And outer coating on the material ex an egg or a dome

Composite

Combined different materials with different properties for a specific purpose

Live load

Forces that act on the structure but are not part of the structure

Aesthetics

Properties of an object to make it pleasing to the senses

Mass

The amount of matter in a substance

Center of gravity

The point at which all gravitational force of an object may be considered

Load

The weight carried or supported by a structure

Dead load

The weight of the structure upon itself

Compression

When the material is being squished

Internal forces

Forces that act on an object from the inside

External forces

Forces that act on object from the outside

Weight

The pull of gravity on the object


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