Work Energy Power

Cards (6)

  • FΔxcos θ
    work done on an object by a constant force  the angle between the force and the displacement.
  • conservative force
    work done in moving an object between two points is independent of the path taken.
    Examples are gravitational force,
  • work-energy theorem:

    The work done on an object by a net force is equal to the change in kinetic energy of the object
  • non-conservative force:

    work done in moving an object between two points depends on the path taken.
    Examples are frictional force, air resistance, tension in a chord, etc.
  • principle of conservation of mechanical energy
    The total mechanical energy (sum of gravitational potential energy and kinetic energy) in an isolated system remains constant.
    NOTE: A system is isolated when the net external force (excluding the gravitational force) acting on the system is zero.
  • power
    the rate at which work is done or energy is expended.
    In symbols:
    P = W/ ∆t