Energy

• What is a system?

  an object or group of objects
• What are the different energy stores?

  • Kinetic energy
  • Elastic potential energy
  • Gravitational potential energy
  • Thermal energy
  • Chemical energy
• What is Kinetic energy?

  The energy stored in moving objects. Stationary objects have no kinetic energy
• What is the equation for Kinetic Energy?

  Ek = $\frac{1}{2}\times m\times v^2$
• How are the energy stored in a car changed?

  Chemical store in the petrol is changed to kinetic store
• What is the elastic potential energy store?

  The force that is applied to an object to change its shape
• The extension of a spring is ...

  directly proportional to the force applied
• What is the limit of proportionality?

  the point beyond which the Hooke's law is no longer true when stretching a material
• What equation to work out the elastic potential energy?

  $E_e=$$\frac{1}{2}ke^2$
• What is the Gravitational Potential Energy of an object?

  The energy stored in an object is due to its position above the Earth's surface. This is due to the force of gravity acting on an object
• What is the equation to work out the Gravitational Potential energy of an object?

  Ep = mgh
• What is the specific heat capacity?

  the amount of energy required to raise the temperature of 1 kg of the substance by 1C