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Ok, thanks jim_mich, pequade and Furcurequs. I'll have to give the 3 different answers some thought.

Thanks guys, some great responses!

Thanks for the detailed reply Jim. Lets assume for theory that there is no friction, the rod, rope and pulley are weightless and the following dimensions: Weights on rod = 1kg each Rod weights are 1m from the center. Pulley has a radius of 10cm Falling mass = 500g Is there a formula that will tell m...

Hi Bilbo, yes i've seen your other thread, but I am really just looking for the formulas that would be relevant for the calculations I mentioned.

Assuming the rod weights are say 1kg and the mass is say 500g.

What is 'a' (in F=ma) after 1 second, or 5 seconds?

If we have a rod with an equal weight at both ends and a pivot point in the middle (see attached pic), how do you calculate the amount of weight required to spin it to say 10RPM, and how long it will take to reach the 10RPM from standstill (I believe its called breakaway torque)?

Grimer, i'm a bit confused are you saying this: 1. You have a weight attached to the wheel at 12 o'clock 2. You drop the weight from 12 o'clock 3. The weight then hits a stop on the rim at say 3 o'clock 4. The impact from the weight causes the wheel to turn 5. The weight bounces back up to its start...

Nick had proposed mounting a golf club on a pivot so that it acts like a pendulum, then having it hit a ball at the bottom of the swing.

My question is, would that ball travel further if we also put a pronation type action on the club (as golfers do), rather than just a fixed downward swing.

http://winwithinbaseball.blogspot.com/2 ... lland.html

This also leads to greater force in a straight line behind the ball and accordingly greater velocity

I used to play alot of Badminton. One of the keys to hitting the shuttle harder is to pronate your arm during the swing. The power gained by doing this v's straight hitting is quite remarkable. The top tennis players all pronate when serving to gain extra power. You can also see it in golf, boxing, ...

Stupid question, whats a scapular leaf spring?

Skateboard bearings are cool. They are cheap, easy to obtain and run well out of the box.

I've tried things like door rollers in the past but they are normally 'sticky" when you buy them and need to be run in.

Homemade linear bearings pics attached. Made from 12mm aluminium square tubing and 8 x skateboard bearings.

Amazing what you can build with a hacksaw, hand drill and a spanner :)

Fletcher, I made the linear bearings from 12mm square aluminium tubing, 8 x skateboard bearings per unit, and some bolts. I was pretty happy with the way they worked out as you can adjust the play on them using the bolts. They also act as a weight as they each weigh 480g. The rod is the same 12mm al...

Nice sim's Fletcher!