Work & Machines Flashcards
Work
when you exert a force
Joule
The SI unit for work
Power
The rate at which work is done
Watt
One joule of work done in one second is a watt
Machine
Devices that allow you to do work in a easier way
Input force
The force you exert when doing work
Output force
The force exerted on an object by a machine
Mechanical advantage
The number of times a machine increases a force exerted on it
Efficiency
The percentage of the input work that is converted to output work
Simple machine
The most basic device for making work easier
Inclined plane
A flat sloped surface
Wedge
A device that is thick at one end and tapers to a Thing edge at the other end
Screw
A simple machine that is related to a inclined plane
Lever
A ridged bar that is free to pivot, or rotate
Fulcrum
The fixed point that a lever pivots around
