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Viewing g as the value of Earth's gravitational field near the surface rather than the acceleration due to gravity near Earth's surface for an object in freefall.

When a circuit is connected and complete, charge can move through the circuit. Charge will not move unless there is a reason, a force to drive it around the circuit. Think of it as though charge is at rest and some- thing has to push it along. This means that work needs to be done to make charge move. A force acts on the charges, doing work, to make them move. The force is provided by the battery in the circuit.

This 32 minute long YouTube video investigates the water contamination problems in Tanzania, with specific focus on Dar Es Salaam. 

This 11 minute long YouTube video describes the various causes and types of water pollutants.

This YouTube video investigates what water pollution is and some examples and effects of water pollution.

Write and solve vertical addition problems with whole numbers.

Write and solve vertical division problems with whole numbers.

Write and solve vertical multiplication problems with whole numbers. 

Write and solve vertical subtraction problems with whole numbers.

Part 1: What whole numbers are and how to express them on the number line
Part 2: How to compare whole numbers and how to find the successor and predecessor
Part 3: Common misconceptions about whole numbers