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3
Unit I
Motion
Lead – in
1. a) What examples of motion can you give? (Birds fly … .)
b) What examples of acceleration can you give? (Cars speed up … .)
2. Read the following summary and fill in the gaps with the given words.
Then read the text to see if you were right.
downward – вниз; speed – скорость; velocity – скорость в определенном
направлении; acceleration – ускорение; position – положение; constant –
постоянный; moving – движущийся
Motion is everywhere. It occurs when an object changes its 1) ……….. .
The most obvious aspect of the motion of a 2) ……….. object is how fast it is
moving – its speed and velocity. These terms are often used interchangeably.
The difference is that 3) ……….. is a scalar quantity and 4) ……….. is a vector
quantity. 5) ……….. is defined as the time rate of change of velocity. The
acceleration of gravity at the Earth’s surface is directed 6) ……….. . An object
in uniform circular motion has a 7) ……….. speed.
Reading
3. For each question (A-J) choose the part of the text (1-10) which contains
an answer.
A What can be said about an object whose velocity is changing?
B What quantities are represented by magnitude and direction?
C What motion does an object experience if it moves in a circle at a constant
speed?
D What activity is an obvious part of everyday life?
E What experiences result from acceleration when you drive down a straight
highway or on a circular cloverleaf?
F When do we say that motion has occurred?
G Who first claimed that all objects, light or heavy, fall with the same
acceleration?
H What term refers to how far an object travels in a given time interval?
I In what directions can acceleration be?
J What is the basic difference between speed and velocity?
1 D
Motion is everywhere. Birds fly. The wind blows the trees. The rivers
flow. Even the continents drift. In the larger environment the Earth rotates on its
3
Unit I
Motion
Lead – in
1. a) What examples of motion can you give? (Birds fly ….)
b) What examples of acceleration can you give? (Cars speed up ….)
2. Read the following summary and fill in the gaps with the given words.
Then read the text to see if you were right.
downward – вниз; speed – скорость; velocity – скорость в определенном
направлении; acceleration – ускорение; position – положение; constant –
постоянный; moving – движущийся
Motion is everywhere. It occurs when an object changes its 1) ……….. .
The most obvious aspect of the motion of a 2) ……….. object is how fast it is
moving – its speed and velocity. These terms are often used interchangeably.
The difference is that 3) ……….. is a scalar quantity and 4) ……….. is a vector
quantity. 5) ……….. is defined as the time rate of change of velocity. The
acceleration of gravity at the Earth’s surface is directed 6) ……….. . An object
in uniform circular motion has a 7) ……….. speed.
Reading
3. For each question (A-J) choose the part of the text (1-10) which contains
an answer.
A What can be said about an object whose velocity is changing?
B What quantities are represented by magnitude and direction?
C What motion does an object experience if it moves in a circle at a constant
speed?
D What activity is an obvious part of everyday life?
E What experiences result from acceleration when you drive down a straight
highway or on a circular cloverleaf?
F When do we say that motion has occurred?
G Who first claimed that all objects, light or heavy, fall with the same
acceleration?
H What term refers to how far an object travels in a given time interval?
I In what directions can acceleration be?
J What is the basic difference between speed and velocity?
1 D
Motion is everywhere. Birds fly. The wind blows the trees. The rivers
flow. Even the continents drift. In the larger environment the Earth rotates on its
