26 terms

This set will cover Abeka Physics Chapter 11: "Work and Machines" (pages 158-171).

work

term for the transfer of energy from one body to another

force

The amount of work accomplished depends on the magnitude of the ____.

W = Fd and W = Pt

the basic work equation and the equation for work in terms of power

scalar quantity

Is work a vector quantity or a scalar quantity?

negative work

A force applied opposite to the motion does _____ ____.

net work

term for the algebraic sum of positive work and negative work

power

term for the time rate of doing work

P = W / t

the equation for average power

watt

the SI unit of power

fulcrum

term for a point on which a lever pivots freely

load

term for an object resting on one end of the lever

input force

term for the force applied to a lever

output force

term for the force applied to the load by a lever

input distance

term for the distance through which the input force acts

output distance

term for the distance through which the output force acts

input lever arm

term for the distance from the fulcrum to the point of application of the input force

output lever arm

term for the distance from the fulcrum to the load

input work

term for the work done on a lever

law of levers

law that states that the input force times the length of the input lever arm equals the output force times the length of the output lever arm

mechanical advantage

term for the ability of a machine to multiply force

class 1 lever

type of lever in which the input force and load are located on **opposite** sides

class 2 lever

type of lever in which the input force and the load are located on the **same** side of the fulcrum

class 3 lever

type of lever in which the input force is **between** the fulcrum and the load

inclined plane

simple machine that allows heavy objects to be raised by sliding or rolling them along a slope

block and tackle

term for a device that uses several pulleys in combination

efficiency

term for the output work divided the input work