# Work energy principle - mechanics

Q.  According to work energy principle, a particle of mass m when subjected to unbalanced force system, the work done during displacement by all forces is equal to change in ____________ during displacement.
- Published on 18 Sep 15

a. gravitational energy
b. kinetic energy
c. mechanical energy
d. potential energy

#### Discussion

• Sravanthi   -Posted on 15 Dec 15
- According to work energy principle, a particle of mass m when subjected to unbalanced force system, the work done during displacement by all forces is equal to change in kinetic energy during displacement.

- Work energy principle is represented symbolically as shown below:

According to Newton's 2nd law,

Force = mass x acceleration

Integrating this equation, we get

Algebraic sum of work done by different forces = Difference between kinetic energy of the systems at two different positions.

W1→2= (Kinetic energy)2 - (Kinetic energy)1

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