**Today we are continuing Work and Energy.**

So far, you have already learned and are able to:

§ calculate work done by a force, kinetic energy and gravitational potential energy;

§ explain that work done against friction is dissipated to the surroundings;

§ describe energy conversions and the conservation of energy.

**Objectives: **

Having completed this lesson, students should be able to:

- calculate the work done by a constant force in situations including those where the force is not in the same direction as the displacement;

- explain how the work done by a force is related to energy conversions and energy conservation;

- apply the principle of conservation of energy to simple examples (e.g. the motion of a load on a slope and the motion of a roller coaster car);

- use the equation for kinetic energy: KE = ½*mv*^{2};

- use the equation for gravitational potential energy changes: PE_{g }= *mg*Δ*h*.

**Method:** you will go to the computers as a group.

Log in and go to

Select the following:

Physics

Mechanics

Work and Energy

Lesson

Energy Transformations

As you go through the lesson, make sure you pay attention to each part of the lesson and **take notes.** Write down any questions (and answers) and information from each page in your notes that you think is helpful for future reference. I will be checking your notes at the end of the lesson. Do not write everything down.

**Take notes of important and helpful information.**

Try each simulation multiple times with different variables so you can truly see what is happening.

As you work through the lessons, **perform the calculations for yourselves** before selecting the final row in the ‘Calculate work’ table, to check your answers.

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