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This 20 minute YouTube video explores the differences between small and large scale agriculture and the uses of each.

This video explains how to round decimals.

Most of us use electricity every day in many different ways so it is important that we understand the dangers, or hazards, associated with electricity and we know how to use it safely.

According to Creative Commons there are over 1.6 billion openly licensed teaching and learning resources available on the internet. Open Educational Resources (OER) are quality, free educational resources, that you can use without having to ask for permission, and that can be adapted to better suit local contexts and needs.

Many educators and developers don't know how to efficiently search for and identity useful resources. Some throw up their hands in horror and give up when tasked with finding suitable resources on the Internet. In this tutorial, we are committed to providing you with a search strategy for open content to ensure that you quickly find open resources. Let us begin!

On completion of this unit of study you will be able to:

• Decipher open licenses i.e. identify rights and permissions contained within Creative Commons licences attached to open content.
• Search for open content using common tools and filters such as on Google Advanced Search and the YouTube Creative Commons filter, as well as specialized services such as Creative Commons Search to find open media.

In this lesson you will learn about:

• Simple machines
• Be able to identify different kinds of machines
• Identify classes of levers and pulleys
• Determine mechanical advantage of a lever and pulleys
• Understand and determine the advantage of an inclined plane
• Describe and determine the advantage of a screw jack
• Describe and determine the advantage of a wheel and axel
• Describe and determine the advantage of a hydraulic press

What are simple machines? Simple machines are tools that make work easier. They have few or no moving parts. These machines use energy to do work with one movement. They make our work easier by letting us use less mechanical effort to move an object.

This is an online activity providing you with exercises in sorting decimals from least to greatest.

Speed necessary for the space station to stay in orbit.

Electric charge comes in two varieties, which we call positive and negative. Like charges repel each other, and unlike charges attract each other. Thus, two positive charges repel each other, as do two negative charges. A positive charge and a negative charge attract each other.

How do we know there are two types of electric charge? When various materials are rubbed together in controlled ways, certain combinations of materials always result in a net charge of one type on one material and a net charge of the opposite type on the other material. By convention, we call one type of charge positive and the other type negative.

In this lesson you will learn that:

• Static electricity is a build-up of charge in an object.
• The build-up pf charge is caused by insulating materials rub against each other.
• The motion of these charges causes small shocks, lightening and sparks.
• These charges can be detected. 
• Certain materials can be classified as insulators, and others as conductors.
• Capacitors are small devices in circuits which can store charge.
• Lightning rods are used to allow charges from strikes to travel safely and dissipate in the Earth