HOMEWORK:
1. Please, check
the solutions to the exercises you
did this week from the books of N.S.
(Student´s Book and Activity Book).
(Student´s Book and Activity Book).
UNIT 6 Natural Science – MACHINES AND INVENTIONS
3º NS STUDENT´S
BOOK (solutions)
PAGE 98
SOLUTIONS
1 Petrol. Today we use petrol, diesel or electricity.
2 The Wright brothers. It could fly for 30 minutes.
3 Pupils' own answers.
PAGE 99
SOLUTIONS
4 The telegraph.
5 Morse Code.
6 Pupils' own answers.
PAGES 100, 101
SOLUTIONS
1 – Answers:
a. 1.pencil sharpener; 2.swivel chair; 3.scissors; 4.pulley;
5.slide; 6.roller skates; 7.pizza cutter; 8.tap.
b. 1.screw; wedge, 2.wheels, screws, lever; 3.screw, wedge;
4.pulley, wheels, screws; 5. inclined plane, screws; 6. wheels, screws; 7.wedge,
screw, wheel; 8.screw.
2 Pupils' own answers.
3 a. car, for transport; horse and carriage; b.
washing machine, for washing clothes; People in the past used to wash their
clothes in rivers.
4 Fridge, for storing food safely, (electricity); microwave,
for reheating food safely, (electricity); washing machine, for cleaning fabric,
(electricity and water); vacuum cleaner, for cleaning surfaces, (electricity);
cooker, for cooking food safely, (electricity or gas).
5 Pupils' own answers.
6 Pupils' own answers.
7 Pupils' own answers.
PAGES 102, 103
SOLUTIONS
1 – Answers:
SIMPLE MACHINES: pulley, lever, wedge, screw, inclined
plane, wheel and axle.
COMPLEX MACHINES: transportation and communication.
Transportation: bicycle, car, steam train.
Communication: telegraph, telephone, smartphone,
2 - a.pulley - b.lever - c.screw
3 - c.the drill
4 - a.the telegraph, communication - b.telephone,
electrical - c.lever, bicycle - d.steam engines, industrial.
5 - Answers from left to right are: steam engine;
1804; telegraph; 1876; car; 1903; smartphone.
6 -
Pupil A
a. What is a complex machine made up of? (Simple
machines)
b. What started the transport revolution? (Steam
engine and steam trains)
c. Who invented the telephone? (Alexander Graham Bell)
Pupil B
a. What is a simple machine? (A machine with no or few
moving parts)
b. Do all complex machines use electricity? (No, they
don't.)
c. What is a pulley used for? (Lifting and lowering
objects)
3º NS ACTIVITY
BOOK (solutions)
PAGE 35
SOLUTIONS
8 – a. communication revolution – b. aeroplane – c.
steam engine – d. car – e. smartphone – f. telegraph – g. train – h. Morse
code.
9 – Answers: 2. This is a fridge. It is used for
keeping food cold. – 3. This is a microwave. It is used for heating food. – 4.
This is a washing machine. It is used for cleaning clothes. – 5. This is a
vacuum cleaner. It is used for cleaning the floors.
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