WORK A

ND

POW

ER

HO

W W

E G

ET

ST

UF F D

ON

E! ! !

WHAT IS WORK?Work: occurs when a force causes an object to move

in

the direction of the force applied

FORCE HEAVYBOX

IF THE FORCE MOVES TO THE EAST, THEN IN ORDER TO

BE WORK…THE BOX MUST MOVE EAST AS WELL!!

HOW CAN WE TELL WHEN WORK IS DONE?

2 CHARACTERISTICS OF WORK BEING

DONE:

1. THE OBJECT MOVES WHEN A

FORCE IS APPLIED2. THE OBJECT MOVES IN THE SAME DIRECTION THAT THE FORCE IS APPLIED

WORK OR NO WORK?

CALCULATING WORK

HOW DO WE FIND HOW MUCH WORK IS BEING DONE?

WORK = FORCE X DISTANCEWORK = NEWTONS X

METERSUNITS = JOULES (J)

MORE MATH!!

PRACTICE CALCULATING WORK

WELL WHAT IF I GET MY WORK DONE QUICKER?

YOU’VE GOT POWER!!Power: the rate at which work is done

CALCULATING POWER

POWER = WORK ÷ TIME

POWER = JOULES ÷ SECONDS

UNITS = WATTS (W)

EVEN MORE MATH!!

CAN WE GET MORE POWER?

TWO WAYS TO INCREASE POWER:

YES!!

1. INCREASE THE WORK BEING DONE2. DECREASE THE TIME IT TAKES TO DO THE WORK