Английский язык. Ильичева Н.А - 17 стр.

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6) a. The acceleration produced by an unbalanced force is ……. proportional to
   the magnitude of the force and ……. proportional to the mass of the object.
   (inversely / directly)

7. Complete the sentences using a word from the list below:
level, external, formal, opposite, celestial, natural, inclined, uniform, equal,
constant, unbalanced, straight

1. Galileo made a ……… (официальный) statement concerning objects at rest
   and in motion.
2. ………. (небесный) bodies don’t stay at rest.
3. Galileo studied motion using a ball running onto a ………
   (горизонтальный) plane from an ……… (наклонный) plane.
4. Motion occurs when the applied forces are ……… (противоположный) and
   unbalanced, that is, when they are not ………. (равный).
5. An object will remain in ……… (равномерный) motion in a ………
   (прямой) line unless acted upon by an ……… (внешний), ………
   (неуравновешенный) force.
6. The ……… (естественный) state of motion is at a ……… (постоянный)
   velocity.
7. Forces may act on an object in ……… (противоположный) directions.

8. Complete the sentences with the words from the list:
introduced, concluded, causes, required, remain, related, resists, prevailed,
produce, recognized, reasoned, act on, defined, continue, rolling

1. An unbalanced force ……… an acceleration. (являться причиной)
2. If an object is at rest it seems to want to ……… so. (остаться)
3. Inertia is the property that ……… changes in motion. (сопротивляться)
4. A force is a quantity that can ……… motion. (вызвать)
5. Forces may ……… an object in different directions. (воздействовать)
6. The ball could ……… in motion indefinitely on a perfectly smooth surface.
   (продолжать)
7. He used a ball ……… on a level surface. (катящийся)
8. Acceleration was ……… as the time rate of the change of velocity.
   (определять)
9. He ……… that the object could naturally remain in motion. (сделать вывод)
10. He ………. that on a perfectly smooth surface the ball would continue in
   motion indefinitely. (рассуждать, доказывать)
11. Newton also ……… this phenomenon. (признавать)
12. Galileo ………. another concept. (ввести, представить)
13. Aristotle’s theory of motion had ……… for some fifteen centuries.
   (господствовать)