the best science on the web about
mechanical efficiency

Mechanical Efficiency
Image: iStockphoto.com/7000

Mechanical Efficiency

Machines are certainly useful, but they can never attain 100% efficiency. Simple or compound, some of a machine's energy always goes into overcoming friction and producing waste heat and, perhaps, noise.

So how efficient are machines in the real world? As it happens, you can figure that out. Find out how.

Sophia Learning
Mechanical Advantage & Friction

Mechanical Advantage & Friction

Eureka cartoons are fun to watch, even when they're about things like simple machines and friction. In this one, see why the lever is far more efficient than the inclined plane. More...

Video
TV Ontario
Friction Basics

Friction Basics

Friction is necessary to light a match. It's also the reason no machine is 100% efficient. But what is friction? Rub up against this resource for an explanation. More...

Activity
Physics4kids.com
Pedal Power

Pedal Power

Talk about putting a compound machine to work! The SciGirls design an ice cream maker powered by pedaling on a bike. More...

Video
SciGirls/PBS
Calculating Efficiency of Simple Machines

Calculating Efficiency of Simple Machines

This site gives you 2 ways to calculate mechanical efficiency. Remember that TMA means Theoretical Mechanical Advantage and AMA means Actual Mechanical Advantage. More...

Article
Leyden Science
Efficiency of Machines

Efficiency of Machines

A typical car is only about 15% efficient — but this site is very efficient at explaining mechanical efficiency. More...

Article
School for Champions
Mechanical Advantage & Efficiency of Machines

Mechanical Advantage & Efficiency of Machines

A car jack is an inefficient machine, but does that mean it's useless? Try lifting a car without one! More...

Article
Columbia Electronic Encyclopedia
Power & Efficiency

Power & Efficiency

As a machines moves, friction and air resistance turn some of its kinetic energy into useless heat and sound energy. More...

Interactive
S-Cool
Regenerative Braking?

Regenerative Braking?

How does regenerative braking change the efficiency of the motor of the electric car? Find out in this episode of Gearless! More...

Video
GearlessUK
What Is Mechanical Efficiency During Exercise?

What Is Mechanical Efficiency During Exercise?

Mechanical efficiency is also a term used to describe how efficiently people do a certain exercise. More...

Article
LiveStrong.com
What Physics Says About Perpetual Motion Machines & Free Energy

What Physics Says About Perpetual Motion Machines & Free Energy

A perpetual motion machine would never stop once it was set in motion. Because no machine can have a mechanical efficiency of 100%, perpetual motion machines cannot exist. More...

Article
From Quarks to Quasars

You Also Might Like

  1. thin films

    thin films

  2. internal combustion engines

    internal combustion engines

  3. conservation of mass

    conservation of mass

  4. power grid

    power grid

  5. cooling & refrigeration

    cooling & refrigeration