If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Class 11 Physics (India) - Hindi

### Course: Class 11 Physics (India) - Hindi>Unit 4

Lesson 3: Work-energy theorem (Hindi)

# Work-energy theorem review

Review the key concepts, equations, and skills for the work-energy theorem.  Understand how the work-energy theorem only applies to the net work, not the work done by a single source.

## Key terms

Term (symbol)Meaning
Net work (${W}_{\text{net}}$)Work done by the net force on an object. SI units of $\text{Joules (J)}$ or $\text{N}\cdot \text{m}$
Work-energy theoremNet work done on an object equals the object’s change in kinetic energy. Also called the work-energy principle.

## Equations

EquationSymbolsMeaning in words
$\begin{array}{rl}{W}_{\text{net}}& =K-{K}_{0}\\ & =\mathrm{\Delta }K\end{array}$${W}_{\text{net}}$ is net work, $K$ is final kinetic energy, ${K}_{0}$ is initial kinetic energy, and $\mathrm{\Delta }K$ is change in kinetic energyThe net work on an object is equal to the object’s final kinetic energy minus the initial kinetic energy.

## Common mistakes and misconceptions

Sometimes people forget that the work-energy theorem only applies to the net work, not the work done by a single force. The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.