课 1 . 机器
clarendon learning explores simple
machines for kids hey kids in the
beginning everything had a beginning
think about it huge bustling cities
started out as little towns with little
buildings we wouldn’t have super cars of
Karl Benz hadn’t built his first motor
wagon and we never would have gone to
the moon if someone hadn’t invented the
wheel the wheel and axle is an example
of a simple machine and this is what
we’re going to explore today simple
machines let me introduce you to some
important helpers of mind we call them
simple machines the inclined plane the
lever the wedge the screw the wheel and
axle and the pulley these tools have
made the work I do so much easier I like
to show them to you and I’d like you to
use your imagination are you ready to
learn about simple machines awesome
let’s go keep in mind that a simple
machine has few moving parts and should
enable you to do more work with less
effort and energy look at this person
hoist a sail with a simple machine she’s
doing more work with less effort she’s
crossing the ocean with a simple machine
this is the inclined plane where ramp it
can be used to lift heavy objects from a
lower level to a higher level how much
do you think this dump truck weighs it
weighs around 628 tons that’s 1 百万
two hundred fifty six thousand pounds
whoa and this inclined plane is helping
this machine get from a lower level to a
higher level with the greatest of ease
using a gradual ramp enables you to
travel up and down much easier and using
a ramp is the way that a person in a
wheelchair can get up over a curb or
into many buildings with multi levels
maybe the ancient Pyramids of Giza were
using the inclined plane I wonder what
other simple machine might make good use
of the inclined plane hey how about the
wheel and axle yeah moving equipment up
and down a ramp using wheels is easy
the wheel and axle are used all over the
world for all sorts of things here’s an
example of my friend mr. pottery man I
wonder what he’s making I bet it says
cereal bowl to hold a lot of cereal and
what’s he using to make that cereal bowl
you’re right a wheel and axle good job
the wheel is probably the greatest
simple machine of all time
think of everything the wheel can do and
what we use it for just about everything
in the world moves because of the wheel
planes trains automobiles bicycles
unicycles wagons horse carts pickup
trucks and trucks wheelbarrows skates
and scooters wait whoa back up is that a
six wheeled truck whoa the wheel and
axle have meant the work we do easier
and recreation more fun I mean how fun
when a bike B with square wheels next if
you give me a fulcrum or a pivot and a
plane I’ll give you a lever actually
three types of lovers depending where
you put the pivot some examples of the
lever as a simple machine are scissors
pliers a baseball bat your arm and elbow
is a good example of the lever the lever
gives us leverage to move things a
teeter totter is a super fun simple
machine just ask lily and max hello
friends the shovel is a combination of
two simple machines the lever and the
wedge yes the wedge is a simple machine
and very powerful with the wedge I can
split wood with a knife as a wedge I can
cut through steaks and chicken and
vegetables with ease I like the wedge I
can use it as a doorstop and keep my
door open
a nail is another example of the wedge a
very small but important simple machine
look at the screw a simple machine all
by itself with the screw I can attach
this to a wall I can drill a hole I can
seal a bottle with the screw on cap and
the spiral staircase yep a screw
what about curly fries I don’t think
they’re a simple machine but these sure
do look yummy and I’m getting hungry but
to screw is a very cool simple machine
which brings us to the final simple
machine last of all but not the least of
all the pulley the pulley is like a
wheel but with the groove with a couple
of pulleys and a rope you can exhibit
superhuman strength look at this example
of mr. kitty getting pulled up by a
pulley look how huge that crane is a lot
of huge buildings all over the world are
built by cranes a simple machine the
elevator uses the simple machine
technology of the pulley and who loves
elevator rides I do we just learned
about the six simple machines do you
remember what they are the inclined
plane the wheel and axle the lever
the screw the wedge and the pulley great
job these are the simple machines
they’re around us every day
and when you assemble several simple
machines together you get cool things
like cars airplanes and roller coasters
the bicycle uses many simple machines
can you figure out what they are can you
see the wheel the lever and the pulley
good job
today’s assignment is to look around and
identify the simple machines in the
world around you and while you’re at it
check out the Clarendon learning
activity pages made for your grade level
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