Understanding sticking points

[Barry Charles]

Coach, given that most people have sticking points somewhere between the start of the lift and the lockout, why are partial reps noticeably easier than full reps?

For example, if your squat tend to fail at midpoint, you may be able to lift the same weight for a 3/4 depth squat.

Thanks!

[Mark Rippetoe]

W = F x D.

[Barry Charles]

W = F x D.

Difference In work is the only thing I could come up after thinking about it for some time.

It seems like it should be more complicated than that, sticking points, rebound, etc. but it really isn’t.