[Ether]

Given:

Robot with 4 standard (non-omni non-mec) wheels.

No drivetrain (no gearbox, no chains; just wheels with frictionless bearings)

Total mass of robot *including the wheels* is Mrobot

Total mass of the 4 wheels is Mwheels

Assume that when you push the robot, the wheels rotate (instead of sliding on the floor)

Assume that the mass of the wheels is evenly distributed,
like a solid disc rather than a hoop.

Problem:

Find the "equivalent mass", Me, such that

F = Me*a

...where "a" is the acceleration and "F" is the pushing force.