©a. weinberg simple machines sol 3.2 by ms. weinberg
TRANSCRIPT
©A. Weinberg
You have probably used some simple machines, but did not realize that they were actually
called simple machines!
©A. Weinberg
Simple machines do not make less work; they just make it easier
to do work.
It would be hard to cut this wood without the saw!
©A. Weinberg
There are 6 different types of simple machines:
•(1)lever
•(2)screw
•(3)pulley
•(4)wheel & axle
•(5)inclined plane
•(6)wedge
©A. Weinberg
(1) LEVER
A lever is a stiff bar that moves about a fixed point (fulcrum).
A lever is used to push, pull, or lift things.
©A. Weinberg
(2) SCREW
A screw is an inclined plane wrapped around a cylinder or cone.
A common use of the screw is to hold objects together.
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A jar lid and a wood screw are examples of a screw.
So far we have learned about 2 types of simple machines: levers & screws….
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(3) PULLEY
A pulley is a wheel that has a rope wrapped around it.
Pulleys can be used to lift heavy objects by changing the direction
or amount of the force.
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A flagpole uses a pulley to raise the flag.
Now we have learned about 3 types of simple machines: levers, screws, and pulleys…..
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(4) WHEEL & AXLE
A wheel & axle consists of a rod attached to a wheel.
A wheel & axle makes it easier to move or turn things.
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A bicycle wheel, roller skates, and a doorknob are all examples of a wheel
& axle.
We now know about 4 types of simple machines: levers, screws, pulleys, and wheels & axles.
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(5) INCLINED PLANE
An inclined plane is a flat surface that is raised so that one end is
higher than the other.
An inclined plane helps move heavy objects up or down.
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A ramp is an example of an inclined plane.
Let’s add inclined plane to our list of simple machines (along with levers, screws, pulleys, and wheels & axles).
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(6) WEDGE
A wedge is wide at one end and pointed at the other to help cut or
split other objects.
©A. Weinberg
Now you know about the 6 types of simple machines:
(1) LEVER
(2) SCREW
(6) WEDGE
(3) PULLEY
(4) WHEEL & AXLE
(5) INCLINED
PLANE