The sliding velocity in a wear test can be calculated using the rotational speed (rpm), and the diameter of the disk. Here is how you can calculate it:

The first step is to convert the rotational speed from revolutions per minute (rpm) to revolutions per second (rps) since we typically measure velocity in meters per second. You can do this by dividing the rotational speed by 60:

ω (rps) = ω (rpm) / 60

Next, you calculate the circumference of the disk, which is the distance a point on the edge of the disk travels in one revolution. The circumference (C) of a circle is given by the formula C = πd, where d is the diameter of the disk.

C (m) = πd (m)

Finally, you calculate the sliding velocity (v) by multiplying the rotational speed (ω) by the circumference (C).

v (m/s) = ω (rps) * C (m)

This will give you the sliding velocity in meters per second (m/s).

Goodluck

Its quite easy.

V= 2*pi*r*n/t

pi= 3.14

r= radius

n= number of rotation made

t= total time of test