Unit 6 Flashcards
Displacement
in the description of work, the difference between the initial position of an object and its position after it has moved some distance as a result of the application of force; if an object has not been displaced by the applied force no work has been done
Energy
the ability, capacity, or capability of a physical system to do work
Force
a push or pull; any quantity that produces, or is capable of producing, motion
Fulcrum
\FUHL-kruhm\
the pivot about which a lever turns
Joule
\jool\
SI-derived unit to measure energy, work, and quantity of heat; for work, a joule is the amount of work done by a force of 1 N acting through 1 m; also newton-meter
Mechanical Advantage
benefit gained by use of a mechanism (such as a simple machine) to transmit force—specifically, ratio of the force that performs the useful work of a machine to the force that is applied to the machine
Negative Work
work done as a result of force applied in the opposite direction as the object´s motion
Newton-Meter
SI-derived unit to measure energy, work, and quantity of heat; force times length (N × m)
Positive Work
work done as a result of force applied in the same direction as the object´s motion
Power
rate at which work is done or rate at which energy is produced or used
Simple Machine
a machine that uses a single force to do work and that is an assembly unto itself – no compound parts (more than one simple machine making up the assembly) make up the whole
Watt
unit of measure of power; 1 watt is the rate of work done at 1 joule per second (1 W = 1 J/s)
Work
amount of energy transferred to or from an object (a body or system) as a result of forces acting upon the object (a body or system), causing displacement of the object
