- #1
Guni22
- 7
- 0
There is a tricep machine which is basically a pulley, with some rope connected to a stack of weights and a bar for you to push down on using your triceps on the other end of the rope.
How is it possible that if I'm 140 pounds, I can lift like 180 or more on that machine? If I want to want the weight of 180 pounds, then I must apply more than 180 pounds of force on the bar. But if I only weigh 140 pounds, won't I just be lifted up off the floor? I thought that I could resolve this by thinking that maybe I was just transferring the gravity of my body onto the bar, but my muscles are providing extra force, but isn't that just an internal force?
How is it possible that if I'm 140 pounds, I can lift like 180 or more on that machine? If I want to want the weight of 180 pounds, then I must apply more than 180 pounds of force on the bar. But if I only weigh 140 pounds, won't I just be lifted up off the floor? I thought that I could resolve this by thinking that maybe I was just transferring the gravity of my body onto the bar, but my muscles are providing extra force, but isn't that just an internal force?