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17 Cards in this Set

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Work

product of the net force on an object and the distance through which the object is moved

Joule

the unit of work

Power

is the rate at which work is done

Watt

the unit of power ( Joule per second )

Energy

the property of an object or that enables it to do work

Mechanical energy

energy due to the position of something or the movement of something

Potential energy (PE)

energy that is stored or held in readiness

Kinetic energy (KE)

energy of motion

Work-energy theorem

relationship between work and energy


Work=(delta)KE

Law of conversation of energy

energy cannot be created or destroyed it can be transformed from one form into another, but the total amount of energy never changes

Machine

is a device used to multiply force or simply change the direction of the forces

Lever

is a simple machine made of a bar that turns about a fixed point

Fulcrum

pivot point

Mechanical advantage

ratio of output force to input force

Pulley

a kind of lever that is used to change the direction of forces



Efficiency

useful work output/total work input=






actual mechanical adv./theoretical mechanical adv

Fuel cell

electrolysis process ran backwards


in a fuel cell hydrogen and oxygen gas are compressed at electrodes to produce water and electric current