Forces, Stresses and Reinforcing

What is the force that tries to stretch an object and pull it apart?

• Tension

• Compression

• Friction

• Gravity

What is the opposite of tension, where forces are directed towards one another and act to squash and shorten objects?

• Compression

• Expansion

• Shear

• Torsion

Shear forces often act in ______ directions, and can cause parts of an object to slide past one another.

• opposite

• same

• parallel

• circular

A bending force is a type of ______ force that causes materials to bend.

• shear

• tensile

• compressive

• torsional

What is the process called where more layers are added to a material to form a composite material/product (composed of two or more materials) to provide extra stiffness?

• Lamination

• Welding

• Casting

• Extrusion

Plywood is a laminated product. What is the grain direction in a layer of plywood set at to the layers above and below it?

• 0°

• 45°

• 90°

• 180°

Interfacings are extra layers of fabric stuck or sewn onto the inside of products to improve strength, rigidity, ______ and aesthetics

• functionality

• colour

• pattern

Webbing is a fabric that is woven in a way that gives a very high ______ strength.

• tensile

• compressive

• shear

• bending

Bending is often used to reinforce and stiffen materials.

• True

• False

Folding is the bending of a flexible material so that the two sides of the bend are flat against each other. Along a fold a crease is made - and along a crease the material is made more flexible.

• True

• False