Energy

• POTENTIAL ENERGY

  • the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
• The force exerted by the force field always tends towards lower energy and will act to reduce the potential energy.
• In potential energy vs position graph, the Force is the negative slope.
• In potential energy,

  0 Force = point of equilibrium

  Increasing PE (potential energy) = negative force
• • Positive slope results to negative force and increase in potential energy
• • Negative slope results to positive force and decrease in potential energy
• Zero slopes have zero force and has potential energy at equilibrium
• An object is in equilibrium if the net force acting on it is zero.
• A turning point is a location where Kinetic Energy (K) is zero and the total mechanical energy (E) is equal to the potential energy (U)
• TOTAL MECHANICAL ENERGY

  refers to the sum of the potential energy and the kinetic energy
• Law of Conservation

  • A principle that states that a certain physical property does not change in the course of time within an isolated physical system.
• The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.
• Work is done on a body by the net force acting on it is equal to the change in its kinetic energy.
• Work is done on an object that changes its elevation due to the gravitational potential energy gained by the object.
•  Work done is equivalent to the elastic potential energy gained by the string.
• WORK

  •  is the scalar or dot product of force and displacement
• ENERGY

  •  is the capacity to do work
• Potential Energy

  •  the energy possessed by a body by virtue of its position or configuration
• Gravitational Potential Energy

  • is the energy possessed by an object because of its position in a gravitational field
• ELASTIC POTENTIAL ENERGY

  is the energy stored by stretching or compressing an elastic object by an external force.