muscle tension and force I will describe two different scenarios.

[waynegr]

@rainy.here

Your friend’s calculations are accurate. The assumption about a constant acceleration is an oversimplification, but it doesn’t matter for you questions.

Of course it takes more force to lower a weight slowly: how much force does it take to drop a weight?

I would have thought if you say lowered 100kg slowely as in 8 seconds for 1m, and then lowred the same weight for 2 seconds, that as of the acceleration component, That when a given load is lifted slightely faster, the acceleration component means that the forces exerted on the load (and thereby by the muscles) by will exceed the nominal weight of the load ???

But what I was really trying to work out was the below, if you have time please could you help.

I was trying to work out the force needed to lift a 100kg weight. However the lifter first is lowering this weight at .5 of a second, in 1m, and at the last instant, say the last 20% he has the accelerate this weight up 1m at .5 of a second.

Someone worked out for me the lifting and lowering of a 100kg for 1m each way at .5/.5 and 2/4. However, as the force need is going to be higher in the transition from the eccentric to the concentric, in each repetition of the lifting and lowering in weightlifting, I was hoping to work this out, as it’s a bit over my head.

Wayne