simple machines · a lever is a simple machine used to lift, cut, or open objects. ... windmill...
TRANSCRIPT
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1 ©2012 Micron Foundation, Inc. |
Simple Machines
Micron Foundation
K-12 Program
February 9, 2016
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2 ©2012 Micron Foundation, Inc. | February 9, 2016
What Will We Discover?
▶ What a simple machine is
▶ How we use simple machines in our daily lives
▶ The different types of simple machines
▶ What is the definition of work
▶ The importance of simple machines
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3 ©2012 Micron Foundation, Inc. |
What is a Machine?
February 9, 2016
What the dictionary says:
Machine:
A system or device which uses energy to perform a task.
A system that helps you do work.
Simple Machine:
A machine with few or no moving parts.
A non-powered device that either multiplies or changes
the direction of a force.
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4 ©2012 Micron Foundation, Inc. | February 9, 2016
Types of Simple Machines
▶ Lever
▶ Pulley
▶ Wheel and Axle
▶ Gears
Inclined
plane
Screw
Wedge
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5 ©2012 Micron Foundation, Inc. | February 9, 2016
What Simple Machines do you see?
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6 ©2012 Micron Foundation, Inc. | February 9, 2016
Today’s Focus
Lever
Pulley
Gears + Wheel & Axle
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7 ©2012 Micron Foundation, Inc. | February 9, 2016
Levers
▶ A lever is a simple machine used to lift, cut, or open
objects.
▶ Parts of a lever:
Straight rod or arm that pivots on a point called a fulcrum, a load
and an effort (or force)
▶ Three types of levers:
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8 ©2012 Micron Foundation, Inc. | February 9, 2016
Examples of Levers
▶ Door on hinges
▶ Seesaw
▶ Hammer
▶ Bottle opener
▶ Fork
▶ Nutcracker
▶ Shovel
▶ Crowbar
▶ Fishing rod
▶ Wheelbarrow
▶ Wrench
▶ Stapler
▶ Scissors
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9 ©2012 Micron Foundation, Inc. | February 9, 2016
Pulleys
▶ A pulley can change the direction or size of the effort force,
making it easier to lift objects to a higher place.
▶ A pulley is made up of a grooved wheel that turns around
an axle with a rope passing through it.
▶ Three types of pulleys:
Fixed
Moveable
Combined
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10 ©2012 Micron Foundation, Inc. | February 9, 2016
Examples of Pulleys
▶ Flag pole
▶ Mini-blinds
▶ Elevator
▶ Winch
▶ Wishing well
▶ Crane
Window washing
platform
Ski lift
Rigging on a
sailboat
The swing at the
Discovery Center
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11 ©2012 Micron Foundation, Inc. | February 9, 2016
Wheel and Axle ▶ The wheel and axle consists of a
large wheel rigidly secured to a smaller wheel or shaft, called an axle
▶ A force applied to the wheel is multiplied when it is transferred to the axle, which travels a shorter distance than the wheel.
▶ The wheel and axle can be thought of as a type of lever that rotates around a center fulcrum.
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12 ©2012 Micron Foundation, Inc. | February 9, 2016
Examples of Wheel and Axle
▶ Pencil sharpener
▶ Rolling pin
▶ Windmill
▶ Roller blades
▶ Dishwasher rack rollers
▶ Ferris Wheel
▶ Bike wheels
▶ Furniture casters
▶ Fan
▶ Door knob
▶ Skate board
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13 ©2012 Micron Foundation, Inc. | February 9, 2016
Gears ▶ Gears are used to slow
things down or speed things
up, which also changes the
force required.
▶ Gears are used to change
direction.
▶ Gear description:
Toothed or pegged wheels
that fit together to change
direction or transmit
motion and force
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14 ©2012 Micron Foundation, Inc. | February 9, 2016
Examples of Gears ▶ Clock
▶ Automobile
▶ Drill
▶ Hand-mixer
▶ Bicycle gears
▶ Guitar tuning pegs
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15 ©2012 Micron Foundation, Inc. | February 9, 2016
Machines help us to do Work. What is Work?
In Science, Work is the amount of energy necessary to move an object.
It is defined as a Force Applied Through a Distance
Work = Force x Distance (times)
Force = exertion of physical power
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16 ©2012 Micron Foundation, Inc. | February 9, 2016
Activity Stations and Safety
▶ Stations
Lever
Pulley
Gears / Wheel and axle
▶ Safety
Follow instructions
Keep hands to your sides
Wait your turn
Only do actions as
instructed
Have FUN!
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