Work-Energy theorem is the fundamental basis of handling problems involving physical situations in several domains of physics where energy transformations take place. Whenever some work is done by a force, it is equal to the decrease in energy of the agent who is doing the work and same amount of energy increases in the body/agent on which work is done.
If work is done on/by a rigid body, it is
equal to change in kinetic energy of body if only mechanical energy is involved,
as rigid body cannot store potential energy on its own. This is the basis we
use for application of Work-Energy Theorem while using it for rigid bodies.
To understand basics of Work-Energy Theorem
follow the video – https://youtu.be/uvNZu1yy9Co
Relation
in Potential Energy and Force: We know that
Potential Energy is a characteristic of Conservative force fields only where no
dissipation of energy takes place. Whenever some work is done on or by an
external agent in a conservative force field, this work is always equal to
change in stored potential energy of the force field. Based on this concept we
can deduce the relation in potential energy and force. Please see the video for
details – https://youtu.be/QBM0U-6vkzk
To understand the same with applications of
the above logic, see the example videos below –
Ashish Arora is the Head of Academics at the Allen Career Institute, Jaipur, Rajasthan. He is also the Founder and Chief Mentor at the Physicsgalaxy.com. His passion for physics has inspired many IIT aspirants.