RECAP THE CONCEPTS

• Energy is the ability to do work or cause a change. There are different forms of energy.

  
  

• Energy can be converted from one form to another but it cannot be created nor destroyed.

  
  

Kinetic Energy

• Kinetic energy is the energy that moving objects have.

  
  

• The greater the mass or the speed of an object, the greater the kinetic energy it possesses.

  
  

• Kinetic energy in a moving object will usually be converted to heat energy due to friction.

  
  

• Some kinetic energy could also be converted into sound energy.

Gravitational Potential Energy

• Any object that is above the ground possesses gravitational potential energy.

• The greater the height or mass of the object, the more gravitational potential energy it has.

• The potential energy of an object can be converted into kinetic energy when it is dropped or allowed to move down a slope.

Elastic Potential Energy

• Springs or rubber bands can be stretched, compressed or twisted to store elastic potential energy.

Chemical Potential Energy

• There is chemical potential energy stored in food.

• Plants are able to convert light energy into chemical potential energy through the process of photosynthesis.

• The chemical potential energy stored in food can be released through the process of respiration.

• This energy is used to carry out life processes, such as movement, growth, digestion and breathing.