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Clip description		Keywords
	The conservation of energy Duration: 03:19 A dramatic illustration of the 'principle of the conservation of energy' in which energy cannot be created or destroyed.	conservation, energy, energy transfer, conservation of energy, heat energy, sound energy, kinetic energy

	Work, energy and power (pt 1/2) Duration: 00:18 A diver demonstrates energy conversion.	gravity,l potential energy, kinetic energy, movement, physics, bitesize

	Energy values of food Duration: 02:09 Food energy values and human energy requirements are explained.	energy, energy value, food, joule (J), kilojoule (KJ)

	Conservation of energy Duration: 01:16 An explanation of gravitational potential energy and kinetic energy through the example of a theme park ride.	theme park, conservation of energy, gravitational potential energy, kinetic energy, friction, heat energy, physics, bitesize

	Energy transfer Duration: 01:15 A demonstration of how energy, which cannot be created, is transferred from one place or object to another.	energy, store, transfer, energy transfer, heat, sound, light

	Potential and kinetic energy Duration: 01:01 A demonstration of how energy is changed from potential to kinetic energy which is used to power a radio.	energy, energy changes, potential energy, kinetic energy, sound, heat, electricity, energy transfer

	Food and energy Duration: 03:09 An investigation into the food energy needs for different activities. How is a high energy-to-weight ratio achieved by a polar explorer?	energy, high energy foods, food, energy value, joules (J), kiljoules (KJ)

	Energy transfers and food chains (pt 2/2) Duration: 01:45 An investigation into the efficiency of energy transfers through a food web or food chain.	ecosystem, energy transfer, efficiency, food web, photosynthesis, food chain

	Heat energy transfer Duration: 01:06 An explanation of how heat energy always moves from hot to cold and how the energy is transferred.	energy, heat, controlling flow, heat travel

	The Sun - a source of energy (pt 1/3) Duration: 01:27 How the sun is the main source of energy for life on earth.	sun, energy, source of energy, solar energy

	What happens to energy in food chains? Duration: 03:37 An investigation into what happens to the energy which is not passed on to the next trophic level in a food chain.	energy, ecosystem, energy use, trophic level, food chain, growth, responding, moving, excretion, respiration, reproduction, feeding

	Heat energy and friction - meteors in the Earth's atmosphere Duration: 01:19 A discussion about heat energy and friction using meteors as an example. When meteors enter the Earth's atmosphere they transfer kinetic energy to heat by friction.	heat, friction, energy transfer, conduction, meteor, kinetic energy, light, vibration, particle, physics, bitesize

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