Science 14 Flashcards
Work
The product of distance and the force in the direction an object moves
Joule
The si unit of work
Power
The rate of doing work
Watt
The si unit of power
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 increases an input force
Actual mechanical 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 the work input that becomes work output in a machine
