Simple Machines | Questions with Short/Long Answers Work input refers to the work done on a machine to produce the intended result. Work output is the quantity of intended work that a machine does. The efficiency of an ideal machine is one since the work output equals the work input. In reality, however, no machine is completely efficient; some energy is lost in the process of converting electrical power into mechanical power and then back again.
The input of a machine can be divided up into two parts: direct and indirect. Direct input means providing power directly to the machine's mechanism, such as turning a handle to rotate a wheel assembly. Indirect input means providing power to a tool used by someone operating the machine, such as a drill press which uses a maul to drive its ram down. Direct input can also include activities like pushing a button or pulling a lever that are necessary to operate many machines.
Indirect input plays a large role in how much effort is required from a human operator. For example, if you were to pull a rope to raise a heavy object, this would be an indirect form of input because you are not giving the object enough force directly to lift it but instead are allowing gravity to do the lifting for you. Direct input, on the other hand, requires very little effort from a human operator as they can simply use their body to provide the needed power.
Work input refers to the work done on a machine to produce the intended result. All real machines have some degree of waste involved in their operation and thus are not completely efficient.
There are two main types of work inputs: human labor and mechanical power. Human labor includes the effort made by people working with their hands or tools. Mechanical power includes the energy used by machines to do work such as motors and pumps. Even heat can be considered mechanical power because it can be converted into mechanical power by devices called engines.
Human labor is the most common work input. It consists of the effort put forth by people performing physical tasks as they construct buildings, dig ditches, or harvest crops. Less obvious forms of human labor include the mental effort of people who design products, invent technologies, or manage organizations.
Mechanical power is much more efficient than human labor and can perform tasks that no person could accomplish in an acceptable amount of time. Machines can also perform tasks in a consistent manner every time without fatigue while humans tend to operate at their maximum capacity for a few hours each day before needing recovery time. Due to these advantages, almost all large-scale projects require mechanical power as a work input.
Work input is work done on a machine to produce the intended output. Energy input is the power consumed by a machine to do its work. It is the rate at which energy is converted into useful work.
Input for a machine is the force applied to it to make it do work. Output for a machine is how much work it does in return. Energy input to a machine is the power consumed by it; it is the rate at which energy is converted into useful work. Input devices for machines are things such as levers, wheels, or magnets; these devices convert potential energy into mechanical energy via their interaction with the machine.
Output devices for machines are objects such as gears, shafts, or jets that produce some effect when acted upon by energy from a motor. They allow the motor to function independently of outside forces.
Energy input to a machine can be provided by any number of different sources, including electricity, steam, gas, wind, water, human effort, and animal power. Machines use the energy they receive from these sources to perform work.
For example, if a machine pulls a rope up one foot, then releases it, it has done one unit of work. If the same machine pulls another rope up, then releases it, it has also done one unit of work.
Work can be measured in many different ways. The most common way is to measure the energy used by a machine. Energy is the capacity of any system to do work - it is the product of mass times velocity squared. For example, one joule is equal to the work done by one kilogramme weight dropped from rest at 10 metres per second-2. In other words, one joule is the amount of energy needed to lift one kilogramme off the ground twice its weight (10 kilograms) over a distance of 10 meters (33 feet).
There are two main types of work: positive and negative. Positive work increases the kinetic energy of an object; negative work decreases it. Positive work is done by all forces acting on an object -- gravity, friction, and air resistance are all forms of positive work.
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