Work, Energy and Power Flashcards
Work done on an object by a force
the product of the displacement and the component of the force parallel to the displacement
work is done when a force acts on an object and the object is displaced
gravitational potential energy
the energy an object possesses due to its position relative to a reference point
kinetic energy
the energy an object has as a result of the object’s motion
mechanical energy
the sum of gravitational potential energy and kinetic energy at a point
energy
the ability to do work, because of the position, nature or movement of an object
Law of Conservation of Energy
the total energy in a system cannot be created nor destroyed; only transferred from one form to another
principle of conservation of mechanical energy
In the absence of air resistance or any external forces, the mechanical energy of an object is constant
work-energy theorem
the work done by a net force on an object is equal to the change in kinetic energy of the object
power
the rate at which work is done
efficiency
the ratio of input power to output power
conservative force
the work done is not dependent on the route taken
ex: gravity, tension force
mechanical energy is conserved (if no friction)
non-conservative force
the work done is dependent on the route taken
ex: friction, applied force
mechanical energy is not conserved
