Experiment
No.9
Objective:
To perform an experiment of the rolling disc on an
inclined plane.
Apparatus:
Inclined plane , stop watch , spirit level , two
rotating discs with self conical pins.
Theory:
Inclined
plane :
An inclined plane is a flat supporting surface
tilted at an angle, with one end higher
than the other , used as an aid for raising or lowerng a load.
Idisc=1/2mR2
Ihoop=mR2
Uses
of inclined plane :
Inclined planes are widely used in the form of
loading ramps to load and upload goods on trucks,ships, and planes. Wheelchairs
ramps are used to allow people in wheelchairs to get over vertical obstacles
without exceeding their strength. Escalators and slanted conveyor belts are
also forms of inclined plane. In a funicular or cable railway a railroad car is
pulled up a steep inclined plane using cables. Inclined planes also allow heavy
fragile objects, including humans, to be safely lowered down a vertical
distance by using the normal force of the plane to reduce the gravitational
force. Aircraft evacuation slides allow people to rapidly and safelyreach the
ground from the height of a passenger airliner.
Moment
of inertia:
A measure of a body’s resistence to angular acceleration, equal to the product of
the mass of the body and the sphere of its distance from the axis of rotation.
Procedure:
We set the height of the inclined plane at desired
angle by using alignment bolt in the apparatus.
Then we observe the position of the inclined plane
on the ground with the help of spirit level.
We balanced the inclined plane with the alignment
bolts.
We roll down the large disc first on the inclined
plane and measure its readings of time by stop watch.
We measured the three consecutive readings of the
time and take the mean reading.
After the large disc we took the small disc and
repeat the same process , note the readings of stop watch and take the mean
reading.
By repeating the above explained process we repeat
the process and took different values of
height of the inclined plane.
At the end, we calculate the actual and theoretical
values of acceleration due to gravity.
Table:
|
Angle
|
Large Disc
|
Mean
|
Small
Disc
|
Mean
|
||||||||
|
α
|
T1
|
T2
|
T3
|
Tlar
|
T1
|
T2
|
T3
|
Tsum
|
||||
|
1o
|
|
|
|
|
|
|
|
|
||||
|
2o
|
|
|
|
|
|
|
|
|
||||
|
3o
|
|
|
|
|
|
|
|
|
||||
|
4o
|
|
|
|
|
|
|
|
|
||||
|
5o
|
|
|
|
|
|
|
|
|
||||
|
6o
|
|
|
|
|
|
|
|
|
||||
|
7o
|
|
|
|
|
|
|
|
|
||||
Precautions:
The inclined plane should be balanced with the
ground so that disc can rotate smoothly .
Use the stopwatch correctly , i.e.; start and stop
at the appropriate time.
Always take the mean value of time so that correct
results may obtain.
Conclusion:
___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
0 Comments