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Similaire à Simple machines (6)
Simple machines
- 3. ©A. Weinberg
You have probably used some simple
machines, but did not realize that they
were actually called simple machines!
- 4. ©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!
- 5. ©A. Weinberg
There are 6 different types of
simple machines:
•(1)lever
•(2)screw
•(3)pulley
•(4)wheel & axle
•(5)inclined plane
•(6)wedge
- 7. ©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.
- 9. ©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.
- 10. ©A. Weinberg
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….
- 11. ©A. Weinberg
(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.
- 12. ©A. Weinberg
A flagpole uses a pulley to raise the flag.
Now we have learned about 3 types of simple
machines: levers, screws, and pulleys…..
- 13. ©A. Weinberg
(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.
- 14. ©A. Weinberg
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.
- 15. ©A. Weinberg
(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.
- 16. ©A. Weinberg
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).
- 19. ©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
- 21. ©A. Weinberg
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