Ch. 14 Flashcards
Work
Product of force and distance
Power
Rate of doing work
Power = work divided by time
Joule
SI unit of work
Watt
SI unit of power
Horsepower
Common unit of power equal to 746 watts
Power equation
Work divided by time
Machine
Device that changes a force
Input distance
Distance the input force acts on
Output force
Force extended by a machine
Work output
Output force times output distance
Input force
Force you exert on a machine
Work input
Work done by the input force
Output distance
Distance out put force is exerted through
Mechanical advantage
Number of times the machine increase an input force
Actual mechanical advantage
Ratio of the output to input force
Ideal mechanical advantage
Mechanical advantage with no friction input d divided by output d
Efficiency
Percent of work input changed to work output
Fulcrum
Fixed point a bar rotates around
Input arm
Distance between input force and fulcrum
Output arm
Distance between output and the fulcrum
Wheel and axle
Consists of 2 disks/cyclinders attached to an axle
Inclined plane
Slanted surface where a force moves
Wedge
V shape object
Screw
Inclined plane wrapped around a cylinder
