Английский язык. Ильичева Н.А - 20 стр.

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20
1. A friend has given you a special gift, a box of
mass 10.0 kg with a mystery surprise inside. The box
is resting on the smooth horizontal surface of a table.
a) Determine the weight of the box.
b) How many forces act on the box?
c) In what directions do they act?
d) What is the magnitude of the force exerted
on the box by the table?
e) What is the net force on the box?
2. Now your friend pushes down on the box with a
force of 40.0 N.
a) How many forces are acting on the box?
b) What is the magnitude of the normal force
acting on the box?
c) Why is the box at rest?
3. Your friend pulls upward on the box with a force
of 40.0 N
a) Is the box’s weight still the same?
b) What is the normal force on the box?
c) Why doesn’t the box move?
d) What is the net force?
15. Nick is talking to his friend Kate who managed to get her car out of the
mud without outside help. Read the conversation filling in the words
from the list:
midpoint, short cut, lonely, magnify, smooth, maximum, at a loss, exceed, tied,
stuck, boot
N: Well, Kate I really can’t understand what made you choose that rough track
through the a) ……… countryside, while there is a wonderful b) ………
motorway to drive on?
K: I was late for my grandmother’s birthday, so I decided to take a c) …….. to
save the time.
N: What did you feel when you found your car d) ………. in the mud?
K: At first, I felt e) ……… because there was nobody around to ask for help. 
                                      20


                          1. A friend has given you a special gift, a box of
                          mass 10.0 kg with a mystery surprise inside. The box
                          is resting on the smooth horizontal surface of a table.
                              a) Determine the weight of the box.
                              b) How many forces act on the box?
                              c) In what directions do they act?
                              d) What is the magnitude of the force exerted
                              on the box by the table?
                              e) What is the net force on the box?

                          2. Now your friend pushes down on the box with a
                          force of 40.0 N.
                             a) How many forces are acting on the box?
                             b) What is the magnitude of the normal force
                          acting on the box?
                             c) Why is the box at rest?



                          3. Your friend pulls upward on the box with a force
                          of 40.0 N
                             a) Is the box’s weight still the same?
                             b) What is the normal force on the box?
                             c) Why doesn’t the box move?
                             d) What is the net force?




15. Nick is talking to his friend Kate who managed to get her car out of the
   mud without outside help. Read the conversation filling in the words
   from the list:
midpoint, short cut, lonely, magnify, smooth, maximum, at a loss, exceed, tied,
stuck, boot

N: Well, Kate I really can’t understand what made you choose that rough track
through the a) ……… countryside, while there is a wonderful b) ………
motorway to drive on?
K: I was late for my grandmother’s birthday, so I decided to take a c) …….. to
save the time.
N: What did you feel when you found your car d) ………. in the mud?
K: At first, I felt e) ……… because there was nobody around to ask for help.

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