simple machines & work no work assessment intro
TRANSCRIPT
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NOW THE WEIGHTS ARE BEING GENTLY
LOWERED TO THE GROUND
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YOU ARE PUSHING ON THE
CAR, BUT IT IS NOT MOVING
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YOU ARE PUSHING THE
CAR UPHILL, BUT IT IS
MOVING DOWNHILL
You are pushing the car
uphill, but it is
moving downhill
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YOU CARRY A 1
GALLON JUG OF
MILK ACROSS
THE ROOM.
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YOU DRAG A 5
GALLON JUG OF
WATER ACROSS
THE ROOM.
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YOU PULL A WAGON DOWN THE
SIDEWALK.
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YOU SIT IN THE WAGON AS IT
ROLLS DOWN THE SIDEWALK
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You are
holding a
heavy
case of
paper.
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You are
running as
fast as you
can down
the track.
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You are sitting at your
desk for 2 hours
memorizing a hard poem for class.
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Definition of work:A force applied to an object in the same direction that the object moves to
cover some distance.
Lowering weights down is not work because though you are exerting a
force(F) it is in the opposite direction of the movement (d)
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W = F • d
W is Work. It is measured in Joules (metric) Foot-pounds (english)
F is force or weight. It can be measured in Newtons or Pounds
d is the distance an object moves that is being acted upon.
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A POWER LIFTER RAISING THE WEIGHTS UP INTO
THE AIR
Weight = 315 lbs.
Distance weight was
moved = Volunteer
Work = ???
Is work being done?
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THE SAME POWER LIFTER HOLDING
THE WEIGHTS UP
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NOW THE 150LB WEIGHTS ARE BEING
GENTLY LOWERED 45 INCHES TO THE
GROUND
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YOU ARE PUSHING ON THE
CAR, BUT IT IS NOT MOVING
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YOU ARE PUSHING THE
CAR UPHILL, BUT IT IS
MOVING DOWNHILL
You are pushing the car
uphill, but it is
moving downhill
![Page 23: Simple machines & work no work assessment intro](https://reader034.vdocument.in/reader034/viewer/2022052622/5595fef01a28ab96308b462f/html5/thumbnails/23.jpg)
You are
holding a
heavy
case of
paper.
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YOU CARRY A 1
GALLON JUG OF
MILK ACROSS
THE ROOM.
![Page 25: Simple machines & work no work assessment intro](https://reader034.vdocument.in/reader034/viewer/2022052622/5595fef01a28ab96308b462f/html5/thumbnails/25.jpg)
YOU DRAG A 5
GALLON JUG OF
WATER ACROSS
THE ROOM.
![Page 26: Simple machines & work no work assessment intro](https://reader034.vdocument.in/reader034/viewer/2022052622/5595fef01a28ab96308b462f/html5/thumbnails/26.jpg)
YOU PULL A WAGON DOWN THE
SIDEWALK.
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YOU SIT IN THE WAGON AS IT
ROLLS DOWN THE SIDEWALK
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You are
running as
fast as you
can down
the track.
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You are
sitting at your
desk for 2
hours
memorizing a
hard poem
for class.
![Page 30: Simple machines & work no work assessment intro](https://reader034.vdocument.in/reader034/viewer/2022052622/5595fef01a28ab96308b462f/html5/thumbnails/30.jpg)
WE CAN MAKE WORK EASIER TO DO BY USING
“SIMPLE MACHINES”
There are 6 simple machines
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1. LEVER: TRANSMIT FORCE THROUGH A RIGID
BAR, WHICH PIVOTS ON AN AXIS.
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2. WHEEL & AXLE: TAKING A LEVER AND MOVING IT IN A
COMPLETE CIRCLE. THE AXLE MUST MOVE WITH THE
WHEEL AS IT TURNS. IF NOT, IT’S CALLED A PULLEY.
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3. PULLEY: A SIMPLE MACHINE THAT CHANGES DIRECTION
OF LINEAR FORCE, BY USING A WHEEL THAT SPINS ON AN
AXLE OR HUB.
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4. INCLINED PLANE, RAMPS: A SLOPED SURFACE THAT
ALLOWS OBJECTS TO BE TRANSPORTED VERTICALLY
WITHOUT DIRECTLY LIFTING THEM.
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5. WEDGE: A SIMPLE MACHINE WITH A LARGE END
TAPERING TO A THIN EDGE USED FOR SEPARATING
OBJECTS OR SECURING THEM.
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6. SCREW: A WEDGE OR INCLINED PLANE THAT
MOVES AROUND A PIVOT POINT
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•NUMBER AND NAME EACH OBJECT
•LIST THE SIMPLE MACHINES IN THE OBJECT IF ANY OR
LIST WAYS YOU CAN MAKE IT WORK LIKE A SIMPLE
MACHINE IF IT ISN’T ONE
Simple Machines I.D. Activity
(1 minute per station to identify)