Work, Energy and Power — Chapter Summary

Work is defined as the dot

Work is defined as the dot product of force and displacement: W = F·S = FS cosθ. Work is done only when a force causes displacement in its direction.

Kinetic energy is the energy

Kinetic energy is the energy of motion, given by KE = ½mv². The work-energy theorem states that the net work done on an object equals its change in ki

Potential energy is stored energy due

Potential energy is stored energy due to position or configuration. Gravitational potential energy is mgh, where h is height. Elastic potential energy

In the absence of non

In the absence of non-conservative forces like friction, the total mechanical energy (KE + PE) of a system remains constant. For example, when an obje

Power is the rate at

Power is the rate at which work is done or energy is transferred: P = W/t. Its SI unit is watt (W), where 1 W = 1 J/s. Power can also be expressed as