work energy theorem
Answers
Kinetic Energy and Work-Energy Theorem
The work-energy theorem states that the work done by all forces acting on a particle equals the change in the particle’s kinetic energy.
The work W done by the net force on a particle equals the change in the particle’s kinetic energy KE:
W
=
Δ
KE
=
1
2
mv
2
f
−
1
2
mv
2
i
The work-energy theorem can be derived from Newton’s second law.
Work transfers energy from one place to another or one form to another. In more general systems than the particle system mentioned here, work can change the potential energy of a mechanical device, the heat energy in a thermal system, or the electrical energy in an electrical device.
The Work-Energy Theorem
The principle of work and kinetic energy (also known as the work-energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This definition can be extended to rigid bodies by defining the work of the torque and rotational kinetic energy.
Kinetic Energy: A force does work on the block. The kinetic energy of the block increases as a result by the amount of work. This relationship is generalized in the work.