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).
UNIT 6 Natural Science – MACHINES AND ENERGY
4º NS STUDENT´S
BOOK (solutions)
PAGES 90, 91
SOLUTIONS
1 a. Tesla; b. It uses the power of falling water to generate
electricity; c. In New York State.
2 Pupils’ own answers.
3 Pupils’ own answers.
4 Pupils’ own answers.
5 Pupils’ own answers, fast building construction, printed
organs.
PAGES 92, 93
SOLUTIONS
1 - a.4; b.2; c.1; d.3; e.5
2 - 1. central heating; 2. electric cars; 3.solar
energy. Pupils’ own ideas.
3 a.true; b.true; c.true.
4 Fridge and freezer; Yes, it saves energy.
PAGES 94, 95
SOLUTIONS
1 – MACHINES can be simple or complex.
SIMPLES machines: puller, lever, screw, wedge, wheel
and axle, inclined plane.
COMPLEX machines: mechanical, thermal, information
processing.
MACHINES use different energy sources: sun, water,
oil, gas.
2 - a. pulley; b. wedge; c. screw; d. wheel and axle; e.
inclined plane; f. lever
3 - a. class 2 lever - b. class 3 lever - c. class 1
lever
4 - a.simple; b.thermal; c.move
5 - Answer: She describes a stapler; It is a complex machine.
6 - a. energy; b.water
7 - a. Hedy Lamarr; b. Archimedes; c. Alexander
Fleming; d. Wilhelm Roentgen; e. Nikola Tesla
4º NS ACTIVITY
BOOK (solutions)
PAGE 37
SOLUTIONS
1 – Answers : 2.
Into – 3. Away – 4. In – 5. Out – 6. Off – 7. Away – 8. Up
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