Common specialist technical principles- Unit 4 Flashcards
What is a static load?
A load that does not move. For example a book resting on a table.
What is a dynamic load?
A load which does move. For example, a book being dropped on a table.
What should designers keep in mind when making a product, in terms of load?
They must make sure that the product can easily withstand the maximum anticipated stress in order to be safe and reliable.
What is tension?
Tension occurs when a pulling force is applied to either end of a material. The object will become stretched as it tries to withstand the force of being pulled apart.
Define tensile strength.
The ability of a material to resist being pulled apart.
What occurs when a pushing force is applied to either end of a material?
Compression.
What is torsion?
The two ends of a material rotating in opposite direction.
What is bending?
Tension and compression forces on either side of an object’s neutral axis.
What is the ability of a material to resist being bent out of shape?
Stiffness.
What is shear force?
A force that acts on an object in a direction perpendicular to it’s length.
What is an example of shear force?
Wind pushing up against a tree.
What does it mean to reinforce a material?
Strengthening a material or object by adding more material to it. Therefore it can better withstand force and stress.
Explain how a car tyre is designed to cope with different forces.
Every element of the rubber tyre has been reinforced. The tread is designed to last a long time and expel water. The side wall is layered to resist bumping into kerbs and collapsing under the cars weight. Steel belts are added to resist punctures from sharp objects.
What is reinforced concrete made from and what is it’s purpose?
It is made from concrete and steel and is used as a strong construction material.
Describe webbing.
A strong fabric woven into strips from yarns. It is used for car seat belts.
Why do people laminate paper?
To improve the paper’s strength and flexibility. When paper is laminated in a plastic pouch, it becomes water resistant and less prone to tearing.