4º NS Unit 6 – MACHINES AND ENERGY (Student´s Book and Activity Book SOLUTIONS)

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