Energy and mass

Posted in A2 Unit 5: Radioactivity, AQA A2 Unit 5 by Mr A on 24 Feb 2010
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Wasted Energy and Efficiency

Posted in AQA GCSE P1a, P1a: Conservation of Energy by Mr A on 24 Jan 2010

Energy Transformation

Posted in AQA GCSE P1a, P1a: Conservation of Energy by Mr A on 17 Jan 2010

Types of Energy

Posted in AQA GCSE P1a, P1a: Conservation of Energy by Mr A on 9 Jan 2010

Energy describes the amount of work that can be done by something.
There are many different types of energy…

  • Kinetic energy (KE) is the energy of movement: the faster something is moving the more KE it has.
  • Gravitational potential energy (GPE) is energy associated with position: the higher something is the more GPE it has.
  • Chemical energy is energy stored in chemical bonds, and may be released when chemical reactions take place. It includes energy stored in food, fuel, or in our bodies.
  • Elastic potential energy is the energy stored in a spring or a rubber band when it is stretched.
  • Electrical energy is the energy transferred by an electric current. Note that batteries store chemical energy, which is converted to electrical energy only when they are being used.
  • Thermal energy is the energy something has due to its temperature. It is actually the KE of its moving particles.
  • Nuclear energy is energy stored in atomic nuclei, released in nuclear fission and fusion.
  • Electromagnetic energy is the energy of a light source, or a source of any type of electromagnetic wave.
  • Sound energy is the energy of vibrating air particles, which we hear as sound. It is really a form of KE.

What forms of energy do each of the following things have?

Electrical Power

Posted in AQA GCSE P1a, P1a: Electrical Devices by Mr A on 9 Jan 2010

This slideshow starts with energy changes, particularly in electrical devices. Various devices are presented as discussion points.

The concept of Power is introduced, along with the equation P=E/t

Electrical Power Slideshow

Work, Energy and Power

Posted in AQA AS Unit 2, AS Unit 2: Mechanics by Mr A on 26 Nov 2009
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Example 1: How fast is a trolley moving if it has 180.5J of kinetic energy?

Example 2: A ball rolls off a table and hits the floor at 5m/s. What is the height of the table?

Work, Energy and Power Questions Sheet (with answers)