Английский язык. Ильичева Н.А - 8 стр.

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ВГУ | Воронеж

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8
постулировал, что все предметы будут падать с i) одинаковым ускорением
j) при отсутствии воздуха или другого сопротивления. Он показал, что
этот постулат k) предполагает , что для предмета, падающего l) из
состояния покоя, m) пройденное расстояние будет пропорционально n)
квдрату времени, то есть d ∝ t
2
11. Read the text again and do the following.
a) Distinguish between scalar and vector quantities and give an example of
each.
b) Distinguish between speed and velocity.
c) Describe how acceleration is related to velocity, and explain the meaning
of a negative acceleration.
d) State Galileo’s observation about freely falling objects.
e) Explain how an object in uniform circular motion is accelerated yet travels
with a constant speed.
Follow – up Activities
12. Match the formulas with their descriptions.
1) d
V =
t
a) a formula for centripetal acceleration
2) V
f
= V
0
+ at b) a formula for average velocity
3) V
2
a
c
=
r
c) a formula for acceleration
4) êV V
f
- V
0
a = =
t t
d) a formula for the final velocity of an
object if its original velocity and
acceleration are known.
13. Complete the definitions with the words from the list:
resistance, signify, change, divided, centripetal, distance, moving, centre,
gravity, displacement, centre
1) In general, the average speed of an object is defined as the distance travelled
along its path ……… by the time it takes to travel this ……… .
2) Velocity is used to …….. both the magnitude (numerical value) of how fast
an object is moving and the direction in which it is ……… . The average
velocity is defined in terms of ……… rather than total distance traveled.
3) Average acceleration is defined as the ……… in velocity divided by the time
taken to make this change. 
                                        8


постулировал, что все предметы будут падать с i) одинаковым ускорением
j) при отсутствии воздуха или другого сопротивления. Он показал, что
этот постулат k) предполагает, что для предмета, падающего l) из
состояния покоя, m) пройденное расстояние будет пропорционально n)
квдрату времени, то есть d ∝ t2

11. Read the text again and do the following.
   a) Distinguish between scalar and vector quantities and give an example of
   each.
   b) Distinguish between speed and velocity.
   c) Describe how acceleration is related to velocity, and explain the meaning
   of a negative acceleration.
   d) State Galileo’s observation about freely falling objects.
   e) Explain how an object in uniform circular motion is accelerated yet travels
   with a constant speed.

Follow – up Activities

12. Match the formulas with their descriptions.
1)       d                        a) a formula for centripetal acceleration
   V=
         t
2) Vf = V0 + at                   b) a formula for average velocity

3)          V2                      c) a formula for acceleration
     ac =
              r
4)          Í V       Vf - V0       d) a formula for the final velocity of an
     a=           =                 object if its original velocity and
             t           t          acceleration are known.

13. Complete the definitions with the words from the list:
   resistance, signify, change, divided, centripetal, distance, moving, centre,
   gravity, displacement, centre
1) In general, the average speed of an object is defined as the distance travelled
   along its path ……… by the time it takes to travel this ……… .
2) Velocity is used to …….. both the magnitude (numerical value) of how fast
   an object is moving and the direction in which it is ……… . The average
   velocity is defined in terms of ……… rather than total distance traveled.
3) Average acceleration is defined as the ……… in velocity divided by the time
   taken to make this change.

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