One research report (Energy Security.pdf) is attached with this post. It is about how we can use engineering to slove energy and global warming problem.

Before explaining I want to clear some basic things.
v=Velocity. Rate of change in the position of an object
v=dx/dt Meters/Second.
a=Acceleration.
a=Rate of change of velocity.
a=dv/dt =dx/dt2.Meters/second2
Because v=dx/dt
Force (F) = M*a=M*dv/dt=M*dx/dt2 Kg-meters/second2 or Newton.
Work=Force* Distance traveled Newton-Meter.

As shown in figure two pulleys can rotate about their axis. Stationary
plate is simply supported on these two pulleys. Now the weight of
stationary plate applied on each pulley in vertical downward direction
is Mg/2. This Mg/2 will divided in two parts. One is tangential and
second is towards the center. Tangential part will help to rotate
pulleys and toward the center part will generate the friction.

Force is stationary and it can help to rotate pulleys at some angle.

Uses and Advantages:

1. It will decrease manufacturing cost.