Page 4 - 新思维科学活动用书8 样章

How to use this book

How to use this book

3.3 Describing movement
3.3 Describing movement

Exercise 3.3A Distance/time graphs 1
This workbook provides questions for Focus
In this exercise, you will decide what you can work out from a distance/time graph.
you to practise what you have learned 1 Which of these can be worked out from a distance/time graph?
Tick (✓) one box.
in class. There is a topic to match each The force on an object.
The speed of an object.
topic in your Learner’s Book. Each The mass of an object.
The weight of an object.
topic contains the following sections: 2 Look at the distance/time graph for a train.

Distance

Focus: these questions help you to a Which of these distance/time graphs shows the train going faster? Time
master the basics
Distance Distance Distance Distance

Time Time Time Time
A B C D
Write the letter.
b Which distance/time graph in part a shows no change in distance with time?
5 Materials and cycles on Earth
Write the letter.
Exercise 5.4B Soil cores
51
Practice
This exercise will give you practice in explaining the use of soil cores.
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1 The core of peat has been removed from a bog. Scientists will study the pollen found in the core.
The end nearer to the left of the picture is from the top of the bog.
Practice: these questions help you to
a Is the oldest peat from the top or the bottom of the bog?
become more confident in using what
b Why has the plant material, including pollen, not rotted in the peat bog?
you have learnt

c What are the scientists hoping to find out by studying the pollen found in the core?

3 Forces and energy
Exercise 3.5C Variables affecting pressure
2 a A scientist studies a core that is 956 cm deep. Between 956 cm and 804 cm and between
490 cm and 250 cm she finds pollen from plants that live in cold regions. What are these cold
Challenge
time periods on Earth known as?
In this exercise, you will consider the variables that affect pressure in solids.
1 The picture shows part of the stem of a plant called a rose. The stem has parts called thorns.
Challenge: these questions will make b In the rest of the core she finds pollen from plants that only live in warmer climates. What
are these warmer time periods on Earth known as?
stem
you think very hard
thorns
108
Explain, in terms of pressure, why touching the thorns is more likely to cause injury than
touching other parts of the stem.
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2 Cars can get stuck in sand when a wheel sinks down into the sand.
Explain why putting a large piece of wood under the wheel can stop the wheel from sinking.

3

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