Design and Technology – Systems and control | e-Consult

How a Lever Works: A lever is a simple machine consisting of a rigid bar that pivots around a fixed point called the fulcrum. The effort is the force applied to one part of the lever, and the load is the resistance being overcome (in this case, the weight of the hay bale). The lever multiplies the effort applied to move the load.

Effect of Fulcrum Position: Moving the fulcrum closer to the load reduces the effort required but increases the distance the effort needs to be applied. Conversely, moving the fulcrum further from the load increases the effort required but reduces the distance the effort needs to be applied. The mechanical advantage (MA) is calculated as: MA = Load / Effort. A higher MA means less effort is needed.

Advantages of using a lever:

• Requires less effort than lifting the bale directly.
• Simple and relatively inexpensive to construct.
• Can lift very heavy loads.

Disadvantages of using a lever:

• The effort distance must be greater than the load distance.
• Can be unstable if not designed properly.
• Requires a stable support for the lever.