Water Dispenser - Student Workbook

Warm Up - “Positive or Negative?”

Many of the things that humans do in the world can greatly impact upon the environment.

Think about each of the human actions below and join a line to either the word ‘positive’ or ‘negative’. One has been completed for you.

Positive

Negative

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Mini-lesson

Keyword Review

Fill in the blanks with the appropriate keyword using the word bank below.

●

Physical Water Scarcity

●

Economic Water Scarcity

●

Climate Change

●

Deforestation

●

Pollution

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Water wastage

There are two types of water scarcity - Physical Water Scarcity and Economic Water Scarcity. ​________________________ ​occurs when there is not enough water to meet our needs. _____________________ occurs when access to water is limited for financial reasons (even though it is available for human needs). ​__________________​, such as altered weather-patterns (including droughts​ ​or floods), _______________, increased ________________ ​and ​________________________ ​can cause insufficient supply of water.

All causes of water scarcity are related to human interference with the water cycle.

Let’s Discuss

In your workbook or with a partner, record, discuss, or share your ideas as to what we can do to help eradicate water shortage in certain areas of the world.

__________________________________________________________________________________________

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Challenge 1

Your Plan: ​Think about the SAM system you need to create and use the space below to design your water dispenser model:

Materials you will have available:

​Light Sensor

Light

DC Motor

Wheel

Car base

Controller

Container

Yoghurt Pot

Lolly Sticks

Thick Card / Cardboard

Cellotape

Scissors

Rice

Blue Tack

Double Sided Tape

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Remember that your water dispenser model must have 3 key parts to it:

Part 1: ​The ‘water system’​. This could represent a well, river, stream, estuary etc.

Within this, there will be a Light Sensor, acting as the input for a system that will monitor how much water is present.

Part 2: ​A ‘plug’​. This will dispense the water from within the system once it gets too full.

The ‘plug’ will be attached to a DC Motor so that it can be mechanically open and closed.

Part 3: ​An ‘overflow​’. This part of the model will collect the full water once it has be dispensed.

Sketch and label your design ideas below:

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We can use transitional phrases to talk about the order events or actions that take place. Practice using transitional phrases when presenting your system.

Time & Sequence

Compare (+)

Contrast (-)

Cause and Effect

first/second/third

also

but

because

next

equally

however

so

after

likewise

otherwise

therefore

then

in addition

on one hand… ...on the other hand

as a result

finally/overall/ to sum up

similarly

opposite

due to

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