Forces and Energy

Forces and Energy

1. Energy

   • Kinetic
     • Moving objects posess kinetic energy. It is present when there is movement
   • Potential
     • Elastic Potential
       • It is present when an object is stretched or compressed
     • Gravitational Potential
       • It is stored energy. It is present when an object is above the ground. The higher the object the more gravitational potential energy it posesses.
     • Chemical Potential
       • It is energy stored in food, batteries or fuels.
   • Heat
     • Present when there is heat
       • On a side note: The larger a volume (like water,) the more heat is needed to increase the temperature of the volume of water.
   • Sound
     • Present when there is sound
   • Light
     • Present when there is light
     • We can see because of (a property) light. The object we look at reflects light from the light source into our eyes. It travels in a straight line. Light cannot pass through opaque objects.
   • Can be converted to other energy forms.

2. Forces

   • Gravitational
     • It is a pulling force. In a diagram we represent gravitational force with an arrow pointing downwards
   • Frictional
     • It is the force that opposes motion. In diagrams, the arrow points in the direction again a moving object
   • Magnetic
     • It either pulls (force of repulsion) or pushes (force of attraction). It can pass through non-magnetic materials.
     • Objects
       • Cobalt (not Copper)
       • Iron
       • Steel
       • Nickel
   • Elastic spring
     • Causes springs to extend
   • Effects of a Force
     • Move a stationary object
     • Stop a moving object
     • Changes the shape of the object
     • Changes the direction of a moving object
     • Changes the speed of a moving object