3. 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!
4. There are 6 different types of
simple machines:
(1). LEVER
(2). SCREW
(3). PULLEY
(4). WHEEL & AXLE
There are 6 different types of
(5). INCLINED PLANE
simple machines: (6). WEDGE
5. (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.
7. (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.
8. A bottle lid and a wood screw are examples of a
screw.
So far we have learned about 2 types of simple
machines: levers & screws….
9. (3) PULLEY
A pulley is a wheel that has a rope wrapped
around it.
A pulley can be used to lift heave objects by
changing the direction or amount of the force.
10. A flagpole uses a pulley to
raise the flag.
Now we have learned about 3 types of simple machines: levers,
screws, and pulleys…..
11. (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.
12. 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.
13. 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.
14. A RAMP IS AN EXAMPLE
OF INCLINED PLANE.
Let’s add inclined plane to our list of simple
machines (along with levers, screws, pulleys,
and wheels & axles).
15. (6) WEDGE
A wedge is wide at one end and pointed at the
other to help cut or split other objects.
16. Now we have learnt about 6 types of simple
machines :-
LEVER (4) WHEEL & AXLE
(2) SCREW (5) INCLINED
PLANE
(3) PULLEY (6) WEDGE
