# Shared Flashcard Set

## Details

Work, Power, Energy, Machines
Work, Power Energy and Machines
12
Physics
9th Grade
03/06/2016

## Cards Return to Set Details

Term
 Machine
Definition
 an apparatus using or applying mechanical power and having several parts, each with a definite function and together performing a particular task.
Term
 Effort Force
Definition
 Effort force is the force that moves an object over a distance by overcoming a resistance force. The formula for force is force = mass x acceleration or F = MA and is measured in newtons
Term
 Resistance Force
Definition
 esistance force is the force which an effort force must overcome in order to do work on an object via a simple machine. Resistance force, like most other forces, is measured in newtons or in pounds-force.
Term
 Work - Output
Definition
 work output is the work done by a simple machine, compound machine, or any type of engine model. In common terms, it is the energy output, which for simple machines is always less than the energy input, even though the forces may be drastically different.
Term
 Work - Input
Definition
 the input work times the input distance
Term
 Mechanical Advantage
Definition
 the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.the advantage gained by the use of a mechanism in transmitting force; specifically : the ratio of the force that performs the useful work of a machine to the force that is applied to the machine
Term
 Resistance Arm
Definition
 A resistance arm is the part of a lever that moves against weight or resistance. It works in conjunction with the force arm to move an object. Ideally, it is the distance between the axis and the point of weight or resistance.
Term
 Pulley
Definition
 a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.
Term
 Fixed Pulley
Definition
 A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference. Mechanical advantage is gained by combining a fixed pulley with a movable pulley or another fixed pulley of a different diameter
Term
 Movable Pulley
Definition
 A movable pulley is a pulley that is free to move up and down, and is attached to a ceiling or other object by two lengths of the same rope. Examples of movable pulleys include construction cranes, modern elevators, and some types of weight lifting machines at the gym.
Term
 Block& Tackle
Definition
 block and tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift or pull heavy loads. The pulleys are assembled together to form blocks and then blocks are paired so that one is fixed and one moves with the load.
Term
 Efficiency
Definition
 One of the most common definitions for efficiency in physics is a measurement of how much of the desired work or product is obtained from each unit of energy invested into that task or product. An additional definition of efficiency is based on the total amount of energy required to produce a specific amount of a product.
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