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Unit D - Mechanical

QuestionAnswer
Margin of Safety The limits within which the safety aspects of a structure are considered to be acceptable; for example, a road sign stating 50 km/h.
Corrugation Forming a material into wave-like ridges or folds; for example, as found in corrugated cardboard.
Lamination Process of gluing layers of material together to create a strong bond; for example, as found in plywood.
Centre of Gravity Imaginary point in an object where the downward force of gravity acts; for example,point at which a ruler is balanced on your finger.
Friction The force that results when the surface of one object moves against the surface of another object; for example, force of your running shoe rubbing on the gym floor.
Structure Any object that provides support; a structure may be made up of one or more parts, and it may be large or small; for example, a chair is a structure.
Force A push or pull that tends to cause an object to change its movement or shape; force is measured in Newtons; an example of force would be pushing a scooter.
Newtons Unit for measuring force; 1 N equals the amount of force needed to hold up a mass of 100 g (1 N = 100g).
Mass Amount of matter in an object
Load External force acting on an object; load can be measured as weight.
Symmetry Balanced arrangement of mass on opposite sides of a line or plane, or around a centre or axis.
External Force Force applied to an object by something else; for example, a person sitting on a chair.
Internal Force Force that one part of a structure exerts on other parts within the same structure; for example, tension on a stretched elastic.
Compression Force that acts to squeeze an object or push parts within an object together.
Tension Force that stretches and pulls apart an object; for example, your force pulling an elastic.
Shear Force that acts to push parts that are in contact with each other in opposite directions; for example, scissors cutting paper create a shear force.
Created by: Sam_101
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