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25 terms

The word ___ means many things and can be used in many different ways.

Work

Work is done only when a ____ (the push) causes a change in the position or motion of an object in the direction of the applied force.

Force

___ us calculated by multiplying the ____ by the ___ over which the force was applied.

Work, Force, Distance

Because work is calculated as ____ times _____, it is measured in units of newtons times, N*m

Force, Distance

These units are also called _____(J)

Joules

A _____ is also equivalent to : 1 kg*m2/s2

Joule

The quantity that measures ___ relation to time is _____.

Work, Power

Power is the ____ at which ___ is done.

Rate, Work

Write the equation for POWER in word form:

Power equals Work divided by time

Write the equation for WORK in word form:

Work equals Force divided by distance

The SI unit of power is the ____ (W)

Watts

A ____ is the amount of power required to do 1 joule of work in 1 second.

Watt

___ help us do work by redistributing the work that we out into them.

Machines

____ can change the direction of an input force

Machines

This is called ____

Multiplying the force

___ is called when scientist and engineers use a number that describes how much the force or distance is multiplied by a machine.

Mechanical Advantages

___ is a quality that measures how much a machine multiplies force or distance

Mechanical Advantages

Mechanical advantages =

___output force___= ___Input distance___

? ?

___output force___= ___Input distance___

? ?

Input force Output distance

___ is the rate at which work is done, that is, how much work is done in a given amount of time

Power

What is the formula for POWER?

P= W/ t

Watts= ?/s

Watts= Joule/ s

What is the unit for force?

Newton

What equals a Joule??

Newton meter

What also equals a Joule???

kg*m2/s2

what is the formula for FORCE?

F=W/d