Work and energy vocabulary Mrs Hawthorne

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energy
the strength and vitality required for sustained physical or mental activity.
joule
the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.
mechanical energy
the energy of an object or system due to its motion or position.
chemical energy
energy stored in the bonds of chemical compounds
radiant energy
energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.
potential energy
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
kinetic energy
energy that a body possesses by virtue of being in motion.
law of conservation of energy
the total energy of an isolated system remains constant
work
activity involving mental or physical effort done in order to achieve a purpose or result.
work input
work done by the input force acting through input distance
work output
force exerted by a machine
efficiency
the state or quality of being efficient.
power
the ability to do something or act in a particular way, especially as a faculty or quality
watt
the SI unit of power, equivalent to one joule per second, corresponding to the power in an electric circuit in which the potential difference is one volt and the current one ampere.
horsepower
a unit of power equal to 550 foot-pounds per second (745.7 watts).
gear
one of a set of toothed wheels that work together to alter the relation between the speed of a driving mechanism (such as the engine of a vehicle or the crank of a bicycle) and the speed of the driven parts (the wheels).
gear ratio
the ratio between the rates at which the last and first gears rotate.
input
what is put in, taken in, or operated on by any process or system.
lever
a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
machine
an apparatus using or applying mechanical power and having several parts, each with a definite function and together performing a particular task.
mechanical advantage
the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.
output
the amount of something produced by a person, machine, or industry.
simple machine
any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever.
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