Chapter 14 Vocab Flashcards
Work
The product of distance and the force in the direction an object moves.
Joule
The SI unit of work, equal to 1 N-meter.
Power
The rate of doing work.
Watt (W)
The SI unit of power, equal to one joule per second.
Machine
A device that changes 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 out 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 (IMA)
The mechanical advantage of a machine in the absence of friction.
Efficiency
I he percentage of the work input that becomes work output in a machine.
Compound machine
A combination of two or more simple machines that operate together.
