EXPERIMENT NO:- TITLE:- NAME:-BRANCH:- ROLL NO:-BATCH:-
DIV:-DATE OF EXPERIMENT PERFORMED:-
FIGURE:-
FREE BODY DIAGRAM
EXPERIMENT NO.TITLE: - LAW OF POLYGON OF FORCES (concurrent
coplanar force system).AIM:- To study Law of polygon of forces for
concurrent coplanar force system.APPARATUS:- Universal force table,
set of weights, pulleys with clamp etc.THEORY:- If all the forces
in a system lie in a single plane and pass through a single point,
then the system constitutes a coplanar concurrent force system.Law
of polygon of forces:- if a number of Concurrent forces acting
simultaneously an a body, are represent in magnitude and direction
by the sides of a polygon, taken in order, then the resultant is
represented in magnitude and direction by the closing side of the
polygon, taken in opposite order.If the body known to be in
equilibrium under this system of forces, the polygon must be closed
in resultant force is zero.PROCEDURE:-To perform the experiment
follows the steps given below.1) Level the universal force table,
by adjusting the screws at base.2) Check the level at top by using
level tube 3) Clamp the pulleys in different position around the
table and pass the cards/thread Over reach pulley4) Tie one end of
all the cords to a common small circular ring and suspend some
weight to the free end of energy cord.5) Adjust the angles and
weights on the different hangers till the ring comes to the central
position.6) Thus the equilibrium of the forces is established.7)
Note down the loads suspended to different cords and their
respective angles. Entered all values in observation table.8) Draw
the polygon for a reading on graph paper with suitable scale. (Each
student should draw for separate reading).
(Five set of the reading)OBSERVATION TABLE:-Sr.
No.ForceF1gmF2gmF3gmF4gmF5gm gm
Magnitude
Magnitude
Magnitude
Magnitude
Magnitude
CALCULATION:- Sample Calculation:- Analytical solution for 1st
Reading Consider the systems. Is in equilibrium= ______________ =
______________ Decides the quadrant of resultant
PRECAUTION & ERRORS:-i) Threads should be parallel to
grooved lines, ring should be at centreii) Check the level of top
surface.iii) Add the weight carefully take reading precisely.
RESULT TABLE:-Sr.NoAnalyticalGraphicalDifference
R (gm)R (gm)R (gm)
1
2
CONCLUSION :- While the result shows some values of resultant
for both analytical and graphical methods, since their difference
is negligible, the law of polygon of forces is studied.
