Physics Energy Lesson 1 Energy stores and Conservation

Physics Energy Lesson 1 Energy stores and Conservation of energy

Do Now- Name the Energy Types es p y t y Energ urces o NOT s

Do Now- Name the Energy Types Nuclear Light Gravitational Electrical Chemical heat Sound elastic kinetic es p y t y Energ urces o NOT s

Aiming for a 4 Aiming for a 6 I can state some examples of energy stores. I can describe changes in energy stores in terms of the process that causes the change Aiming for a 8 I can explain factors that affect the size of changes in energy stores I can identify the processes I can describe a wide range of I can represent energy that can transfer energy from energy stores in different changes graphically, one store to another contexts. accounting for changes in all stores.

What is the energy? • Watch the Road Runner cartoon- what examples of each energy type can you identify? • BONUS- are there are situations where the energy type changes?

Energy Stores We use energy to do work………. . When we eat, our bodies transform the food into energy to do work. We eat pizza- we get energy, because food is a STORE of energy

Energy is stored, and then transferred Energy can be stored in different ways and is transferred by heating, waves, an electric current or when a force moves an objects. Example- Chemical Energy stores including food, fuels or chemicals. Energy is transferred during chemical reactions

Energy stores- there are five Can you think of examples of things that STORE energy? Can you group these things together to find the energy stores?

Energy stores. The eight stores CHEMICAL (in food, fuel or batteries) KINETIC (in a moving object) GRAVITATIONAL(more in an object lifted above its planet) ELASTIC (in a stretched, squashed or twisted object) THERMAL (in an object at high temperature) MAGNETIC (in magnetic forces between magnetic poles) ELECTROSTATIC (in electrical forces between charges) NUCLEAR (in the immensely strong forces in atomic nuclei)

The four pathways • mechanically • electrically • by heating • by radiation (when a force acts and something moves) (when a current flows) (because of a temperature difference) (a wave such as light, microwaves or sound) These are known as PATHWAYS

There are stores, processes but also systems. Lets look at the torch. In a torch the battery pushes a current through a bulb. What is the energy change here? This makes the bulb emit light and also get hot. System- an object or group of objects where the transfer is happening. Store- where the energy is Pathway- how energy is transferred

Energy flow diagrams

Example 1 - bulb connected to a cell CHEMICAL (in cell) electrically By heat lamp By light THERMAL (environment)

Example 1 - bulb connected to a cell CHEMICAL (in cell) electrically By heat lamp By light THERMAL (environment)

Example 2 - candle CHEMICAL (wax fuel) By heat By light THERMAL (environment)

Example 2 - candle CHEMICAL (wax fuel) By heat By light THERMAL (environment)

Car accelerating

motor lifting a weight Kinetic (wind generator)

Catapult- being pulled back Catapult- firing

Pendulum

Another example When an object is thrown into the air the object slows down as it goes up. Here energy is transferred from the objects KE store to its GPE store.

Ok- lets try these……. • Watch the following youtube clips. • Describe the energy changes. • Remember- all energy changes start and end with an energy STORE • The energy is transferred using a PROCESS

Watermelon (2. 40) flamethrower (1. 40) Pop corn (1. 20) Match(1. 55) water balloon

Flamethrower Chemical (in fuel) By heat By light THERMAL (environment)

Pop corn Chemical (in fuel) By heating THERMAL (in pan) By heating kinetic (in pop corn)

water balloon GPE Mechanical (force) elastic Mechanical sound GPE

Conservation of energy

The Pendulum

Bungee jumping

Answer the questions on the worksheet

Questions you should be able to answer by the end of the lesson • Name the FIVE energy stores. • Describe energy transfers, with examples. • Describe the conservation of energy. • Apply the conservation of energy to energy transfers