Physics

• conservation of energy


  Energy cannot be created or destroyed
• dissipated energy / dissipation of energy


  the energy that is not usefully transferred and stored in less useful ways
• closed system


  a group of objects that transfer energy only to each other
• Efficiency


  Useful energy output / total energy input
• Hooke's Law


  Extension is directly proportional to force until the spring reaches it's elastic limit
• Power


  Energy transferred / time
• 1 watt


  The unit of power when one joule of work is done in one second
• spring constant


  force/extension
• Wasted energy


  Energy that is not usefully transferred
• Work done


  force x distance
• work


  energy used to cause an object that has mass to move
• kinetic energy


  energy of motion
• Kinetic energy equation


  KE=1/2mv^2
• gravitational potential energy


  Energy stored by objects due to their position above Earth's surface.
• GPE equation


  GPE=mgh
• Power equation 1


  Power = work done / time taken
• Power equation 2


  Power(w)=Energy(j)/time(s)
• Hooke's Law


  Extension is directly proportional to force until the spring reaches it's elastic limit
• elastic potential energy


  Ee = 1/2 x k x e^2
• energy transferred


  work done
• chemical energy


  potential energy stored in chemical bonds
• thermal energy


  Heat energy
• Friction


  A force that opposes motion and causes energy to be wasted
• Efficiency (power)


  Useful power output / total power input x100