Please enable JavaScript.
Coggle requires JavaScript to display documents.
Energy, Work done and Power - Coggle Diagram
Energy, Work done and Power
Work done
Work done of a constant force is given by the force multiplied by the distance moved by the object in the direction of the applied force
-
-
Energy
-
Kinetic energy
Kinetic energy is the energy possessed by a moving body, and all moving objects have kinetic energy.
-
Kinetic energy can be used to do work, and the greater the speed of an object, the more kinetic energy it has
-
Work-Energy Theorem
The work energy theorem states that the net work done by a force on a body is given by the change in kinetic energy of the body
-
Pendulum
Ideal pendulum
An ideal pendulum is when there is no energy loss to the surroundings in overcoming air resistance and friction, and the total energy conserved is constant
Non-ideal pendulum
A non-ideal pendulum is when there is considerable energy loss to the surroundings in overcoming friction and air resistance, and the total energy conserved is still a constant
Efficiency and power
-
Efficiency
The law of COE states that the energy input is equal to energy output, however, in real life, useful energy output is always less than total energy input as energy is dissipated to the surroundings in the form of sound, thermal energy and friction
Since its unlikely that a machine can convert total energy input to useful energy output, it is useful to know the efficiency of a machine in converting energy input to useful energy output (the difference is known as the wasted energy output)
-