As of 2017, magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. In the field of computing, the term magnetic storage is preferred and in the field of audio and video production, the term magnetic recording is more commonly used.
The development of the spinning machine by Sir Richard Arkwright in England led directly to the rise of the Industrial Revolution, and a new world of manufactured products.
A simple machine is a device that acts to increase or decrease the amount of force output by the machine, F o, compared to the force input to the machine, F i. Energy is still conserved. Although a machine like a lever can increase the force, it does not create any new energy, because energy is a conserved quantity.The amount of work input into the machine must equal the amount of work output by the machine (minus some unavoidable energy loss due to friction). W o = W i (ignoring friction losses).he mechanical advantage of a machine is the factor by which the force is increased. A machine that doubles the force has a mechanical advantage of 2. The Ideal Mechanical Advantage (IMA) is the theoretical result achieved when there is no friction.