Ch 14 Flashcards
Work
Is the product of the force and distance
Joule
Is the si unit for work
Power
Is the rate of doing work
Watt
Is the si unit for power which is equal to to one joule per second
Machine
Is a device that changes
Input force
The force you exert on a machine
Input distance
The distance the input force acts through
Work input
The work done by the input force acting through the input distance
Output force
The force exerted by a machine
Output distance
The distance the output force exerted
Work output
The output force multiplied by the output distance
Mechanical advantage
Of a machine is the number of times that the machine increases an input force
Actual mechanical advantage
The mechanical advantage determined by measuring the actual force on a machine this equals the ratio of the output force to the input force
Ideal mechanical advantage
Of a machine is the mechanical advantage in the absence of friction
Efficiency
The percentage of the work input that becomes work output in a machine
