Recent content by Fizzics

Hi I am looking to purchase a Low RPM, Very efficient DC motor/Generator between 200w and 1kw for a low friction fly wheel project which involves powering up a 10kg flywheel to about 50 RPM over say 30 seconds then recovering the energy back through the motor/Generator with minimal losses...

I went with a chain in the end...Thanks

Hi I'm trying to connect two fly wheels together which are elevated on a bar and about 12 feet apart, the one wheel is driven by a motor and I would like the second wheel to be synchronised in rotation with it. Belts and/or chains are the obvious way forward but would it be difficult to connect...

Thanks for the feedback I will take it all on board

Thank you So two equal masses traveling over a pulley is the same as two equal masses traveling in a straight line if all of the conditions are the same?

My meaning was 100 J per second for 2 seconds = total energy used 200w (1 Watt is the power of a Joule of energy per second ) however this was only an example and not relevant to my questions outcome

They come to rest naturally because of the forces around them such as gravity and air resistance, they are not in a vacuum or perpetual motion. The 2m stopping time is just so that a comparison can be made between the 2 scenarios it could just as easily be a 2 km stopping distance providing...

I guess I have wandered between force and energy without thinking so to try and clarify let's stick with energy required. So let's say that 100 joules of energy is applied to moving mass A in both scenarios in the direction of the arrows for 2 seconds (= 200 watts) then as a result of this let's...

So if it took 50 N initially to move the mass and 45 N Finally to stop the mass the net loss would be 5 N in both cases, is that correct?

Sorry but I don't understand what you are saying, Maybe I should say that the initial force is applied to Mass A in both diagrams and mass B follows because it is connected by a belt.

The equal forces would be applied to mass A sideways and Mass A downwards

That's right

As one mass is going up the other mass is going down the other side of the pulley

Here there are two scenarios for comparison. Scenario 1: We move two connected masses which are Constantly 3 metres apart on a friction free surface using the same force and acceleration in a straight line. Scenario 2: We move two connected masses which are Constantly 3 metres apart over an...