DT unit 4

Question 1

all materials, structures and products have to withstand various forces. Name these forces:

Answer 1

• tension
  -compression
  -torsion
• bending
• shear

Question 2

what is the force equation?

Answer 2

force = mass x acceleration

Question 3

what is the shear force?

Answer 3

a shear force occurs when opposite forces act on an object in a direction perpendicular to its length.

Question 4

what is reinforcing?

Answer 4

reinforcing is a way of strengthening materials

Question 5

what does laminating materials do?

Answer 5

lamination involves bonding two or more layers of materials together to improve working properties such as:
- strength
- rigidity
- flexibility

Question 6

what kind of human activities generate greenhouse gases?

Answer 6

Burning fossil fuels, cutting down forests and farming livestock

Question 7

how could human activity help to reduce the greenhouse effect?

Answer 7

Greenhouse gas emissions can be reduced by making power on-site with renewables and other climate-friendly energy resources

Question 8

what is a carbon foot print?

Answer 8

a carbon footprint is the amount of carbon released into the atmosphere as a result of an individual.

Question 9

what is the term consumer society?

Answer 9

a society in which the buying and selling of goods is the most important social and economic activity.

Question 10

what materials come out of mines?

Answer 10

coal, gold, or iron ore.

Question 11

Which fossil fuels are harvested through