Cam will help to solve energy problem.

[jigar]

It is about using Cam for increase energy efficiency. Cam are generally used to open and close valve of IC Engine. I am going to show you another use. Left side initial position. Right side final position. Redius of cam continuously decrease.Sliding weight (MG) applied on Cam. With the help of rope weight(MG*Cos(b)) is fixed with cam. We consider b as 45. So cos 45=.70. This fixed weight should be 0.70 MG. Which balance the sliding weight applied on cam in tengential direction. As sliding weight come down the fixed weight go up. But the twist is the redius of cam decrease nominal continuously. So sliding weight come down little bit and fixed weight go up much more. We consider sliding weight come dowm H2 height and fixed weight go up H1 height. We consider H1=5H2
Now we calculate energy loss by sliding weight=MG*Height
=MG*H2
Energy got by lifting fixed weight =MG*Cos(b)*Height
=MG*Cos45*H1
=.70MG*5H2 (Because H1=5H2)
=3.5MGH2
=3.5* Energy loss by sliding weight
So we get 3.5 times more energy than we loss. The ratio depend on the rate we decrease redius of cam and angle (b).

The Exact value of H1 is the length of curve from point A to point B. You can easily see black curve on cam from point A (Blue dot ) to point B(Blue dot).