Big Idea: Man and his Environment

• Man can interact with his environment.

• Man can manipulate his environment.

• Man is affected by the environment around us.

• Environment affects and determines how Man works.

Essential/Guiding Questions(use these questions to guide you in your learning of this topic)

• How does Man interact with his environment?

• Why Man manipulates his environment?

• How is Man affected by his environment?

• How does the interrelationship between Man and his environment benefit mankind?

What Is a Force?• A force is a push or a pull.

• A push is a force that is applied on an object that causes it to move in a direction away from our body. (eg we push a trolley, push a door open)

• A pull is a force that is applied towards our body. (eg pull a piece of tissue paper from a box, drag the school bag on the floor)

What Is a Force?

• A combination of a push or a pull produces actions such as twisting and turning.

• Can you name some examples of such forces at work in our everyday lives?

Effects of a Force

• We cannot see a force but we can certainly see the effects of a force when it interacts with an object.

• We know if a force is strong or weak by observing what happens to the object during the interaction.

• Look at the example of forces in nature. We can know how strong/harmful the forces are by looking at the destruction caused.

Destruction caused by hurricanes

Devastation at the Indonesian earthquake

Source: images.search.yahoo.com

Some forces are useful suchas the wind which is a force that can propel sailing boats and windmills (for mills andgeneration of electricity).

Effects of a Force• What else can forces do?• Forces can cause things to:- Start moving- Move faster- ---------- ---------- ---------- ---------(Can you list the rest?)

Not forgetting, useful forces help us to do work. How?

We’ll have to look atMan & His Environment

(BIG IDEA)again!

Man and His Environment• Man interacts with his environment by making

use of machines to make work easier for us.

• These machines can be big or small, simple or complex.

• How do machines make it easier for us to do work?

• Let’s explore!!!

• Let’s go to the website http://www.edheads.org

• Click on Simple Machines

• Click on Simple Machines Glossary to learn about the different types of simple machines

• When you are done with that, go to the Simple Machines Home, under Simple Machines Activities, click Start.

• Test yourself by identifying the different types of simple machines in the various places in The Home and answer the questions within.

• Do likewise for The Tool Shed.

• Have Fun!!!

Welcome Back!

• Remember the essential or guiding questions at the beginning of the presentation?

• Can you try to answer some of the questions?

• Ask yourself if you can link the concepts you’ve learnt to the questions such as:

- How is Man affected by his environment?

- How does the interrelationship between Man and his environment benefit mankind?