# Torque and Rotational Kinetic Energy Relationship

alichoudhry57
I am wondering if it is possible to calculate either the Kinetic Energy or Rotational Kinetic Energy of an object if we have the Power (kW), Torque (Nm), and Speed (RPM) of the object.

Mentor
I am wondering if it is possible to calculate either the Kinetic Energy or Rotational Kinetic Energy of an object if we have the Power (kW), Torque (Nm), and Speed (RPM) of the object.
Depends, but probably not. Do we have a continuous function for those? Is there any more info you can provide on your scenario?

• topsquark
Homework Helper
Gold Member
I am wondering if it is possible to calculate either the Kinetic Energy or Rotational Kinetic Energy of an object if we have the Power (kW), Torque (Nm), and Speed (RPM) of the object.
Welcome @alichoudhry57 !
Objects can’t have those by themselves, as power refers to a transfer of energy, you need at least another object or substance receiving that energy.

• russ_watters and topsquark
Power (kW), Torque (Nm), and Speed (RPM) of the object.
Power can be computed from torque and speed, so it is redundant.

Finding the kinetic energy requires knowing the speed, and the moment of inertia of the object.
https://en.wikipedia.org/wiki/Moment_of_inertia