D- Work, Energy And Power Flashcards
Define the work done on an object by a force, vector or scalar, unit?
The product of the displacement and the component of the force parallel to the displacement , scalar and in joules (J)
Define gravitational potential energy
The energy an object possesses due to it position relative to a reference point
Define kinetic energy
The energy an object has as a result of the object’s motion
Define mechanical energy
Sum of gravitational potential and kinetic energy at a point
State the law of conservation of energy
The total energy in a system cannot be created nor destroyed; only transferred from on form to another
State the principle of conservation of mechanical energy
In the absence of air resistance or any external forces, the mechanical energy of an object is constant
State the work energy theorem
The work done of an oven to is equal to the change in the kinetic energy of the object
Define power
The rate at which work is done or the rate at which energy is transferred
State unit of power
Watt (W)
Define watt
One watt is defined as the power when one joule of work is done I. On second
Define efficiency
The ratio of output power to input power
