HOMEWORK:
1. Check
the solutions to the exercises you
did last week from the books of N.S. (Student´s Book and Activity
Book).
UNIT 6 Natural Science – MACHINES AND INVENTIONS
3º NS STUDENT´S
BOOK (solutions)
PAGE 91
SOLUTIONS
1 Lorry, trolley, lever, cutter, camera, pulley, computer,
etc.
2 Lorry, trolley, lifting jacks, etc.
3 Pupils' own answers, for example:
Simple machines have few or no moving parts
(guillotine, ramp, chair).
A complex machine is made up of simple machines that
work together (printing press, lorry, digital camera).
4 Pupils' own answers using ideas from the picture.
5 Scissors, phone, trolley, hammer, computer.
PAGE 92
SOLUTIONS
1 - c, d, b, a.
PAGES 94, 95
SOLUTIONS
1 - a.2; b.3; c. 1.
2 A simple machine is a machine that makes work easier,
but having few or no moving parts. It needs the energy from the person using it
to work. For example: screw, lever, etc.
3 Possible answers:
Wedges can be used to keep doors open and they are
also used as the cutting edges in scissors. Tweezers and wheelbarrows work
using levers and fulcrums.
A skateboard uses wheels and axles.
4 a. wheel and axle - b.lever - c.wedge
PAGE 96
SOLUTIONS
1 Cars, and any other examples of road vehicles.
2 Wind or human-powered vehicles and machines, etc.
3 Pupils' own answers.
PAGE 97
SOLUTIONS
1 1700; the steam train was invented 104 years later.
2 Burning coal or diesel.
3 It uses magnets to travel at 350 km per hour.
3º NS ACTIVITY
BOOK (solutions)
PAGE 32
SOLUTIONS
1 – A machine is something you use to make work
easier. – A simple machine has few or no moving parts. – A complex machine is
made up of simple machines.
2 – inclined plane – wheel and axle – lever – wedge –
pulley – screw.
3 – a. wheel and axle – b. inclined plane – c. wedge –
d. pulley – e. screw – f. lever.
PAGE 33
SOLUTIONS
4 – a. wheel and axle – b. wedge – c. pulley – d.
lever, screw – e. inclined plane – f. screw, lever.
5 – people – electricity – fuel – electricity – fuel –
people.
PAGE 34
SOLUTIONS
6 – compass – telephone – wheel – lightbulb –
internet.
7 – lightbulb (artificial light) – telephone (speaking
to people in different places) – wheel (land transportation) – internet (world
wide network of computers).
PAGE 36
SOLUTIONS
1 – Student’s own answers. OPEN answers.
PAGE 37
SOLUTIONS
1- b. complex – c. of a finger – d. levels
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