2nd October 2019

quora

Is there anything that is 100 efficient?

A system can never be 100% efficient. The reason behind this is because of heat and sound energy are lost in some amount in every system. No matter they are waste or not. So a system doesn't exist, with 100% efficiency.

In this way, why is the efficiency of a machine not 100%?

Mechanical efficiency. Mechanical efficiency measures the effectiveness of a machine in transforming the energy and power that is input to the device into an output force and movement. Real devices will have efficiency less than 100% because rigid and friction-less systems do not exist.

Is it possible to have a 100 efficient machine?

A simple machine, such as a lever, pulley, or gear train, is "ideal" if the power input is equal to the power output of the device, which means there are no losses. In this case, the mechanical efficiency is 100%.

Why can the efficiency of a heat engine never be 100?

The second law of thermodynamics puts a fundamental limit on the thermal efficiency of all heat engines. Even an ideal, frictionless engine can't convert anywhere near 100% of its input heat into work. No device converting heat into mechanical energy, regardless of its construction, can exceed this efficiency.

What is the unit for measuring efficiency?

The efficiency is the energy output, divided by the energy input, and expressed as a percentage. A perfect process would have an efficiency of 100%. W_out = the work or energy produced by a process. Units are Joules (J).

What are some examples of the six simple machines?

windmill, fan (wheel and axle)
roller coaster, stairs (inclined plane)
sledge hammer, chisels (wedge)
door lock, drill (screw)
flag pole, window blinds (pulley)
seesaw, rake (lever).

What are the 6 types of simple machines?

Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:

Lever.
Wheel and axle.
Pulley.
Inclined plane.
Wedge.
Screw.

Are gears a simple machine?

Gears are also important simple machines. A gear is just a wheel with teeth, sometimes called a cog. To do any work with a gear, you need to have at least two cogs with their teeth fitting into each other. Because the teeth fit together, when you turn one gear, the other one turns too!

What increases the efficiency of a machine?

WHEN ONE INCREASES THE OTHER MUST DECREASE. THIS IS BECAUSE THE WORK OUTPUT IS NEVER GREATER THAN THE WORK INPUT. MECHANICAL EFFICIENCY=WORK OUTPUT/WORK INPUT X 100 Page 2 NO MACHINE IS 100 PERCENT EFFICEINT, BUT REDUCING THE AMOUNT OF FRICTION IN A MACHINE IS A WAY TO INCREASE ITS MECHANICAL EFFICIENCY.

What is the rate at which energy is transformed?

Power implies that energy is transferred, perhaps changing form. Energy transfer can be used to do work, so power is also the rate at which this work is performed. The unit of power is the joule per second (J/s), known as the watt.

What is the number of times a machine multiplies the input force?

mechanical advantage.
a number that tells how many times a machine multiplies force; can be calculated by dividing the output force by the input force.
ideal machine.
a machine that has 100 percent mechanical efficiency.

What is the force that is exerted on a machine called?

The of a machine compares the output work to the input work. A rigid bar that is free to pivot, or rotate, about a fixed point is a(n) . The force you exert on a machine is called the force.

What is the force you exert when using a machine?

The force you exert when using a machine. A comparison of the input force applied to a machine to the output force it must overcome. The ability of a machine to convert input work into output work.

What is a flat slanted surface?

a change in direction that results from passing a rope through a pulley. inclined plane. a flat slanted surface such as a ramp.

How does friction affect the efficiency of a machine?

The more mechanical energy is lost in the transfer to other forms of energy, the less efficient the machine. Machines lose some energy in the form of heat due to friction. For example, a car engine has an efficiency of only about 25 percent. It loses much of the energy supplied by its fuel to heat from combustion.

Is a knife a machine?

Dirtmeister: Simple Machines -- Wedge. A wedge is really an inclined plane turned on its side. The blades of a knife or a shovel are both wedges. A wedge can also be round, like the tip of a nail, or the tines on your fork.

Is a bar that pivots around a fulcrum?

a rigid bar that rests on a fulcrum (a fixed point.) This simple machine is a bar that pivots or turns on a fixed point called a fulcrum. Lever. This simple machine is a flat, slanted surface that works like a ramp.

How many different classes of levers are there?

three types

What is an inclined plane wrapped around a pole?

An inclined plane is a slanting surface connecting a lower level to a higher level. A screw is an inclined plane wrapped around a pole which holds things together or lifts materials. A wedge is an object with at least one slanting side ending in a sharp edge, which cuts material apart.

Is an inclined plane wrapped around a pole?

Transcript of Screw: an inclined plane wrapped around a pole which holds t. Screw: an inclined plane wrapped around a pole which holds things together or lifts materials.

What is a slanting surface connecting a lower level to a higher level?

An object with at least one slanting side ending in a sharp edge, which cuts material apart. An axle moves through its center to lift or move loads. A slanting surface connecting a lower level to a higher level.

What type of simple machine is a seesaw on a playground?

Simple Machines

Question	Answer
What type of simple machine is a seesaw on the playground?	a lever
What type of a simple machine would the bottom of a light bulb be?	a screw
A fork would be an example of what type of simple machine?	a wedge

What is a stiff bar that rests on a support?

A lever is a stiff bar that rests on a support called a fulcrum which lifts or moves loads.

Is there anything that is 100 efficient?

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