# Chapter 12 work, power,and machines

### 28 terms by esthervergesNCAchamp

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### different examples for work are

you work on science problems.
you got to work
raking out the tash is too much work

force

### ____is calculated by multiplying the ____ by the ______ over which the force was applied.

work, force, distance

### the unit of work and energy was named in honor of the english physicist ____ _____ ____

James Prescott Joule

force, distance

joule

joule

power

rate, work

### write the equation for power in word form:

power equals work divided by time

p=W/t

### write the equation for work in word form

work equals force times distance

W=F•d

work

power

Watt

Watt

force

kg•m2/s2

P=W/t

Watts

j/s

### Watt

one joule of work performed in one second

### Joule

equals one Newton-meter

### Power

amount of work performed over time

### Work

force times distance

### Simple Machine

an unpowered mechanical device

quantity that measures how much a machine multiplies force or distance

Example: