Listen to the text and complete the sentences
1. That’s certainly a scary-looking collection of __________.
2. The latest ones can __________ at over half a million revs per minute.
3. The requirement is abrasion __________, of course.
4. Obviously, they need to be very __________.
5. The last thing, you want is __________ material.
6. Drilling into a tooth at __________ speed, you obviously get a lot of heat build-up.
7. You can actually __________ burning.
11. Work in small groups. Imagine that you are a 1st year student and you have to prepare for an examination in physics. Discuss the differences between the following mechanical properties of materials:
- strength and strain
- strength and resistance
- elasticity and plasticity
- stability and durability
- hardness and toughness.
Work in pairs. Discuss the following quotations with your partner.
1. “After a certain high level of technical skill is achieved, science and art tend to coalesce in esthetics, plasticity, and form. The greatest scientists are always artists as well.”
2. “Man is unique not because he does science, and he is unique not because he does art, but because science and art equally are expressions of his marvelous plasticity of mind.”
Jacob Bronowski (Mathematician and science writer)
3. “Every man of action has a strong dose of egoism, pride, hardness, and cunning. But all those things will be regarded as high qualities if he can make them the means to achieve great ends.”
Charles de Gaulle
4. “There is only one quality worse than hardness of heart and that is softness of head.”
5. “I try not to break the rules but merely to test their elasticity.”
Bill Veeck (American businessman)
13. Imagine you are an architect and you are going to design a building, a bridge, a sky-scraper, etc. What should be done to avoid engineering or design disaster? Write a short paragraph (60-80 words) to express your point of view. You may use words and word combinations in the box:
- design and construction - dimensions of the object
- analysis of the design - moveable structure
- detailed structural analysis - substandard design
- draw a diagram - collapse
- scientific calculations - mechanical properties
GRAMMAR IN USE
These tasks can help you to practise the Past Simple Passive (See Appendix 1 p. 228 – 230) and do the following exercises.
14. In the following sentences underline the verbs and define the voice (Active / Passive).
1. Strain was defined as the amount of distortion (extension or compression) that takes place per unit of length.
2. Stabilityis the ability to resist changes in shape and size over time.
3. Force caused material to become stressed.
4. Geothermal energy was produced below the earth's surface.
5. The main sources of greenhouse gas emissions include fossil fuel generating by plants and transportation vehicles.
6. Manufacturers chose plastic containers for many different reasons.
7. Oil was formed in underground rocks millions of years ago.
15. Transform the sentences from the Active into Passive Voice, as in the example.
Example: Romans cremated Julius Caesar’s body 2,000 years ago.
Julius Caesar’s body was cremated 2,000 years ago.
1. Primitive man found metals free in nature.
2. They changed the shape of material by rolling.
3. Someone warped this wooden thing.
4. If someone mixed tin with copper the resulting substance would be harder.
5. The Egyptians and Assyrians made some use of iron a number of centuries before our era.
6. Scientists developed methods for separating iron from its ores in reasonably large quantities and at fairly low cost.
7. They deformed cold plastic by bending.