Page 5 - SIMPLE MACHINES

1. LEVER –
1 .

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p

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en
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p
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• •When a long plank or pole is used to lift a heavy or
us
k
ed
if
is
y
v
t
Wh
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is
c
ed
it
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l

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large load, it is called a lever.
a
rg
er.

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rigid
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l
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im
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• •A lever is a simple machine consists of a long rigid
b a r, w h ic h is f ree t o t urn a b o ut a f ixed p o in t c a l l e d a
bar, which is free to turn about a fixed point called a
f ul c rum .
fulcrum.
h
h
t
e
r

v
• •The object to be lifted or moved is known as the
o
m
T
e
is
ed
o
to
if
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e

t
b
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l

w

j
s

o
b

d
t
a
kn
ec
l o a d , w h il e th e f o rc e a p p l ied o n t h e l ev er t o l if t t h e
load, while the force applied on the lever to lift the
w
o
kn
n
s
a

b
o
object is known as the effort.
j
is
t
ec

f
f
e
.
rt
o
e
th
–
p
ees
m
• •Example of a lever – A seesaw
er
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a
E
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A

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