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4. Give the rest of the irregular verbs forms. Memorize them:

withstand, said, made, meant, left, known, struck.

5. Find all the -ing forms in the text. State their origin. Translate the sentences into Russian.

6. Fill in the blanks with the appropriate prepositions:

  1. The theory…vibrations represents a section…modern physics.

  2. The theory…vibrations is…especial importance.

  3. The problems…vibrations and the behavior…elastic systems…varying loads call…especial attention…the designer.

  4. We may specify the position…the system… any instant…time.

  5. The movement along the axis depends…this angle.

  6. The number…degrees…freedom is determined…the choice…a design scheme.

7. Make up a situation of your own using the following words and word combinations:

definition, theory, importance, structures, elastic, comparison, to introduce, to perform, motion, internal forces, frictional forces.

8. Give the synonyms to:

definition, field (of mechanics), to distinguish, to determine, position, infinite, to solve, to induce, to continue, to overcome.

The antonyms to:

to cover, importance, strong, similar, independent, to attach, to neglect, difficult, specific, natural.

9. Complete the sentences:

  1. The theory of vibrations represents…

  2. The theory of vibrations is of special importance for…

  3. By the number of degrees of freedom is meant…

  4. The number of degrees of freedom is virtually determined by…

  5. By a natural or free vibration is meant…

  6. By a forced vibration is meant…

  7. An exiting force is a force…

  8. The time interval between two successive maximum displacements of an elastic system from its equilibrium position is called…

10. Translate these word combinations paying attention to the word engineering.

electrical engineering, radio engineering, agricultural engineering, aerospace engineering, architectural engineering, atomic power engineering, biological engineering.

11. Answer the questions:

  1. What does the theory of vibrations represent?

  2. Where can the theory of vibrations be applied?

  3. What is the degree of freedom?

  4. How many degrees of freedom has a massive nut rotating and moving along a screw?

  5. What influences the number of degrees of freedom?

  6. What is a distinction between natural and forced vibrations?

  7. What is an exiting force?

  8. What do we call the period of natural or forced vibrations?

  9. What is the frequency of vibrations?

Unit 7 Mechanical Properties of Materials. Strength Theories

1. Pronounce the words correctly:

mechanical; determine; specimen; concrete; occur; failure; yielding; rupture; algebraic; ductile; homogeneous; isotropic; hydrostatic; perpendicular.

2. Memorize the following words and word combinations:

specimen

- образец, экземпляр

strength

- сила, прочность

tensile test

- испытание на разрыв

compression

- сжатие, сдавливание

brittle materials

- хрупкие материалы

yielding point

- предел текучести

rupture

- излом, разрушение

ductile

- эластичный

to equal smth

- быть равным чему-то

dimensional

- пространственный

maximum stress theory

- теория наибольших нормальных натяжений

shear stress

- срезывающее (касательное) напряжение

maximum strain theory

- теория наибольших линейных деформаций

to be invalid

- быть несостоятельным

maximum shear theory

- теория наибольших касательных напряжений

maximum energy theory

- теория полной потенциальной энергии

the strain energy of uniform tension or compression

- потенциальная энергия изменения объема

the strain energy of distortion

- потенциальная энергия изменения формы

octahedral

- восьмигранник

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