I think the example of Working of Lever justifies the statement explained following:A lever makes work easier by reducing the force needed to move a load. Work, in physics, is the product of the force used to lift a load multiplied by the distance the force, or effort, is applied. This relationship can be written mathematically as:Work = Force X DistanceThe amount of work needed to move an object a given distance always remains the same except when friction is present. The lever, like all simple machines, makes doing work easier by reducing the force needed to move an object. In order to reduce the force needed, the distance over which the force is applied must be increased.To increase this distance, the load to be moved must be close to the fulcrum and the force must be applied far from the fulcrum. A good example is a claw hammer used to pry nails loose. The user's hand applies force to the handle at one end of the lever. The head of the hammer is the fulcrum, and the nail at the other end of the lever is the load to be moved. The nail is much closer to the fulcrum than is the hand applying the force. Since the hand is farther away from the fulcrum, the force travels a greater distance than does the load as the nail is pried loose. The same amount of work would have been done if the nail had been pulled directly out by hand. However, by using the lever the force was spread out over a greater distance, and so less force was needed. Another example is a seesaw. The force of a smaller person can balance and even lift the load of a larger person as the smaller person moves farther away from the fulcrum.The mechanical advantage (MA) of a lever tells how much the lever magnifies effort. The greater the MA, the less the effort needed to move a load. The MA of a lever is the ratio of the distance the force travels to the distance the load travels. In practical terms, the MA is the distance of the force to the fulcrum divided by the distance of the load to the fulcrum. Depending on the class of lever and the location of the fulcrum, the MA may be less than or greater than 1.

Mechanical Advantage and Load

Mechanical advantage refers to the ratio of the output force (load) to the input force (effort) in a simple machine. It is a measure of how much a machine amplifies or multiplies the force applied to it. The greater the mechanical advantage, the easier it is to lift heavy loads with a smaller effort.

Understanding the Statement

The statement "mechanical advantage greater than small effort can be used to lift large load" implies that when the mechanical advantage is larger than the effort applied, it becomes possible to lift a load that would otherwise be too heavy to lift with just the effort alone. This concept is fundamental to the functioning of many simple machines.

Explaining the Reasoning

To understand why a mechanical advantage greater than a small effort can lift a large load, we need to consider the principle of work and energy. Work is defined as the product of force and displacement, and it represents the energy transferred to an object to move it. When a machine is used to lift a load, work is done on the load.

By applying a smaller effort to a machine with a mechanical advantage, we can increase the force exerted on the load without increasing the amount of work done. This is possible because the mechanical advantage allows the load to be lifted over a greater distance, compensating for the smaller effort applied.

Visual Representation

To visually represent this concept, imagine a lever with a fulcrum and unequal lengths of the effort arm and the load arm. When the effort arm is shorter than the load arm, a smaller effort can be used to lift a heavier load. The mechanical advantage of the lever is determined by the ratio of the lengths of the load arm to the effort arm.

Importance of Mechanical Advantage

Mechanical advantage plays a crucial role in various everyday scenarios. It enables us to lift heavy objects using tools such as pulleys, levers, and ramps. For example, a block and tackle system, which consists of multiple pulleys, can provide a mechanical advantage greater than the effort applied, making it possible to lift extremely heavy objects.

Conclusion

In summary, the statement "mechanical advantage greater than small effort can be used to lift large load" highlights the importance of mechanical advantage in amplifying the force applied to lift heavy loads. By using simple machines with a mechanical advantage, we can overcome the limitations of our physical strength and accomplish tasks that would otherwise be impossible.

Thanks