Work, Power, and Machines Flashcards
Work
The product of distance and the force in the direction an object moves
Joule
The SI unit of work, equal to 1 newton-meter
Power
The rate of doing work
Watt
The SI unit of power, equal to one joule per second
Machine
A device that changes a force
Input force
The force exerted on a machine
Input distance
The distance through which the input force acts in a machine
Work input
The work done on a machine as the input force acts through the input distance
Output force
The force exerted by a machine
Output distance
The distance an output force acts through in a machine
Work output
The work done by a machine as the output force acts through the output distance
Mechanical advantage
The number of times that a machine an input force
Actual mechanic advantage
The ratio of the output force to the input force in a machine
Ideal mechanical advantage
The mechanical advantage of a machine in the absence of friction
Efficiency
The percentage of work input that becomes work output in a machine
