With the aid machine
we are able magnify the effort
exerted the input and lift move
large loads the output.
By definition, machine assembly parts, some fixed, others mov-
able, which motion and force are transmitted.
Load force Mass Acceleration (N)
Load force 500kg 10m/s2
5000 N
Load force Distance from fulcrum Effort force Distance from fulcrum
5000N Effort force m
∴ Effort force
N m
m
N
5000 1
5
1000
Thus effort force 1000N can overcome load force 5000N using the mechanical
advantage this simple lever.
Definition
By definition, machine assem-
bly parts, some fixed, others mov-
able, which motion and force are
transmitted.
Simple machines
Our physical abilities the field lifting and moving heavy objects are
limited. 4.
. This concept shown Fig. The losses may result from
friction the bearings, wind resistance moving parts, heat, noise or
vibration. With the aid machine
we are able magnify the effort exerted the input and lift move large
loads the output.
Long distance
Fulcrum
Effort force Load force
Short distance
FIGURE 4. However, over the centuries have used our superior intelli-
gence design tools, mechanisms and machines which have overcome
this physical inadequacy.3.2
Turning forces simple lever.
Example
Calculate the effort required raise load 500kg when the effort applied distance
of five times the load distance from the fulcrum (assume the acceleration due gravity be
10m/s2
).
Efficiency any machine
In any machine the power available the output less than that which
is put because losses occur the machine. Thus ‘turning force’ ‘turning moment’
depends upon the distance from the fulcrum and the magnitude the force.Basic Electrical Installation Work
90
short distance from the fulcrum
