Page 36 - Praktis GO！SCIENCE 5 预备，起！科学5

Science Year 5 Answers

8. Lever, gear, wheel and axle
Reinforcement 9 9. Wedge, lever
Practice
D 1. ✓ 4. ✗
Objective Questions 2. ✗ 5. ✓
1. C 2. D 3. A 4. C 5. A 3. ✗
6. A 7. C 8. D 9. B E 1.

Subjective Questions Screw
Wheel and
1. (a) (i) The number of days / date in Lunar Calendar axle
(ii) Moon phases Gear
(b) (i) (inner part)
(c) 2. Indicates time
预备，起！科学5, 版权所有·侵权必究
3. Simple machine Function
Gear Moves and turns the hands
2. (a) Southern Cross constellation
(b) (i) Becomes a guide to determine South direction of the watch
during his sail. Screw Combines the components
(ii) One of the constellations always point to the South. of the watch
(c) As an indicator of season to predict and plan suitable Wheel and axle Sets the clock
time for planting and harvesting season.
(d) 4. Without screws, the components of the watch cannot
be combined. Gears function to move the hands of
the watch whereas wheel and axle functions to set
the watch. Combination of a few simple machines in
this tool enables it to function well.
F 1. Scissors is damaged
South 2. Wedge and lever
(e) Because the Earth rotates on its axis 3. Wedge
(f) At night. The light from the stars can be seen clearly 4. Damaged and blunt wedge causes the scissors
because there is no sunlight. unable to cut the cloth.
(g) Constellations do not appear on cloudy days. G 1. – Saves time, cost and energy
3. (a) Location to observe constellation – Safe to use
(b) Sometimes we cannot see constellations because of 2. – Saves time, cost and energy
cloudy or rainy weather. – Environmental friendly
(c) Big Dipper 3. – Saves time, cost and energy
(d) Based on the brightest group of stars and form certain – Environmental friendly
patterns. – Safe to use
(e) Sunlight is too bright to highlight the stars. – Easy to maintain
H Pupil’s answer
Practice 10 Machines
Reinforcement 10
Practice
10.1 Uses of Tools in Life
Objective Questions
A 1. (a) Wheel and axle
(b) Wedge 1. B 2. C 3. D 4. C 5. A
2. (a) Lever Subjective Questions
(b) Wedge
3. (a) Lever 1. (a) Type of machine
(b) Wheel and axle (b) Machine B
(c) Gear (c) Machine B take a shorter time to type an essay
B 1. Hole puncher compared to machine A.
2. Lever and wedge (d) Machine B makes work faster and saves time and
3. To punch holes in papers. energy.
C 1. Wheel and axle, gear and screw (e) Uses solar energy as the energy source in machine B.
2. Gear, wheel and axle and screw 2. (a) Lifts heavy loads
3. Lever and wheel and axle (b) Cuts off food
4. Wedge and lever (c) Moves from one place to another
5. Wedge and lever (d) (i) B
6. Gear, screw, wheel and axle, wedge (ii) A
7. Wheel and axle, lever, screw

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12 Answer Practice Go Science Yr5.indd 7 24/09/2021 5:31 PM