There is a magnitude component, which in our case is the weight. And there is a directional component, sometimes called the vector. In the case of a powerlifter, that would be straight down, from the force of gravity. While it is true that the force of gravity pulls straight down on an object on the earth s surface, the powerlifter may not necessarily push straight up against gravity to move the weight. In order to minimize wasted energy, it would be of obvious advantage to push straight up, and avoid and movement in other directions.
Lets look a little closer at the squat.
Then, you end up doing a high bar squat like a bodybuilder, where much less weight can be used, because the movement is using mostly quadriceps. Having a muscular imbalance between the left and right legs. No, they are not about eating right, sleeping enough, taking the right supplements, and using the right routine. They all effect balance. I ruptured 2 ligaments in my right ankle four years ago.