Flashcards
Flash cards for forces in DT
Cards in this deck (11)
- 1Forcesa push or pull motion that causes objects to break, change or move
- 2Stressstress is the force per unit area and is often measured as N/m²
- 3Tension forcestretch or pull apart an object.
High tensile strength springs used in trampolines.
High tensile strength cables used to support weight of a bridge. - 4Compression forceCompression is opposite of tension. Instead of forces going out (away from object) they go inwards. act to squash and shorten objects. chair legs supporting a person use compression. chair legs have high compressive strength.
- 5Shear forceshear forces act in opposite directions to each other (just like tensile forces) but instead they are NOT aligned with each other. This causes parts of an object to slide past one another. Examples are scissors, die cutters and guillotines.
- 6Bending forcebending force is a TYPE of shear force that causes materials to bend. This commonly occurs when a load is applied to a CERTAIN part of that material. e.g bench has to resist bending forces when someone sits down in a certain place.
- 7Torsiontorsion acts to twist objects and materials. The force attempt to rotate parts of the material in opposite directions.
Propeller shafts connect propellers to the ships engine which spins in the water and drives the ship forwards. Shafts have the ability to resist torsion to transfer the rotary motion without breaking or twisting. - 8Reinforcementmaterials can be reinforced (strengthened) or stiffened (made more rigid) to help resist certain types of forces. they can also be made more flexible to work better with forces. Enhancing materials can increase functionality.
- 9LaminationLamination is the process in which one or more layers are added to a material to form a composite
Often used to increase strength and rigidity.
foam core board and corrugated card are layered. they're stronger and stiffer than other types of single layer cardboard. Plywood is an example as layers are glued 90 degrees angle (opposite directions) - 10Interfacingsinterfacings are extra layers of fabric stuck or sewn onto the inside of products. Used to stiffen collars, cuffs, pockets, waistbands and button holes. Anywhere that needs strength and rigidity. Used to improve functionality and aesthetics.
- 11Webbingis a fabric (usually cotton, nylon, polyester or polypropylene) that is woven in a way that gives a very high tensile strength. Used in tow ropes, climbing har