Other Hand Tools

A tool is a device or a piece of equipment which typically provides a mechanical advantage in accomplishing a physical task, or provides an ability that is not naturally available to the user of a tool. The most basic tools are simple machines. more...

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For example, a crowbar simply functions as a lever. The further out from the pivot point, the more force is transmitted along the lever. When particularly intended for domestic use, a tool is often called a utensil.

Observation has confirmed that multiple species can use tools, including monkeys, apes, several birds, sea otters, and others. Philosophers originally thought that only humans had the ability to make tools, until zoologists observed birds and monkeys making tools. Now humans' unique relationship to tools is considered to be that we are the only species that uses tools to make other tools.

Most anthropologists believe that the use of tools was an important step in the evolution of mankind. Humans evolved an opposable thumb - useful in holding tools - and increased dramatically in intelligence, which aided in the use of tools.

Some tools can also serve as weapons, such as a hammer or a knife. Similarly, people can use weapons, such as explosives, as tools.

Functions

Tools often employ the principles of a simple machine, which is a device that only requires the application of a single force to work. Many tools or groups of tools serve to perform one or more of a set of basic operations, such as:

Cutting tools, such as the knife, scythe or sickle, are wedge-shaped implements that produce a shearing force along a narrow face. Ideally, the edge of the tool needs to be harder than the material being cut or else the blade will become dulled with repeated use. But even resilient tools will require periodic sharpening, which is the process of removing deformation wear from the edge.; Concentrating force tools, such as the hammer, maul and whip operate by applying physical compression to a surface. In the case of the screwdriver, this force is applied by means of torque. Writing implements deliver a fluid to a surface, and may require some compression to activate.; Guiding and measuring tools include the set square, straightedge and theodolite.; Protecting tools include all personal protective equipment, such as gloves, safety glasses, ear defenders and biohazard suits.; Seizing and holding (pliers, glove, wrench, etc...);

Read more at Wikipedia.org