#### Topic: Force, Work and Power

Hello guys,

I'm mostly using kinovea with weightlifters. Currently, I have to export vertical speed and accel data separately and use the weight to calculate the resulting instantaneous vertical force, work and power. I then add the gravitational force to find out what is the lifter's vertical force on the barbell and calculate his power.

So far, I'm using this, but I could be wrong as I'm no physician.

Fy_total= m*a = barbell weight (kg) * Ay from exported graph data = Fy_lifter - Fy_gravity

So Fy_lifter = Fy_total + Fy_gravity. I then use Fy_lifter * vertical_velocity to measure power.

I wish I could input the object's weight and calculate the data automatically.

Unrelated to this idea/request, is there a way to plot various data from the same trajectory on the same graph, or do I need to use 2 different paths on the same image?

Regards