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→Objectives
=Objectives=
=Objectives=
#To study the motion of a simple pendulum
#To observe the different factors on which the motion of a simple pendulum depends
#Develop an understanding that gravity is a conservative force
==== Pre-requisites ====
Availability of computer, projector, simulation
Prior discussion on forms of energy
==== Method: ====
Use the PhET simulation Pendulum Lab.
For this we will need to open an application called PhET on the
computer. You can find PhET under Applications> Education>
Science. PhET is an educational resource that contains computer
demonstrations of experiments and activities. When we click on Play
with sims – it will open simulations in various subjects. We will
click on Physics and scroll down to the simulation on Pendulum Lab.
When we want to open a simulation, we click on the green
rectangle which says “Run Now”.
After running the simulation show the following video
[[/home/ranjani/Desktop/Conservation of energy/Conservation of Energy in simple pendulum.VOB]]
==== Discussion question for activity ====
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'''Questions:'''
Screenshot #2
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Screenshot #3
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'''Screenshot #4'''
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==== Notes (optional) ====
The motion of a pendulum is a classic example of mechanical energy
conservation. A pendulum moves it sweeps out a circular arc, moving
back and forth in a periodic fashion. Neglecting air resistance
(which would indeed be small for an aerodynamically shaped bob),
there are only two forces acting upon the pendulum bob. One force is
gravity. The force of gravity acts in a downward direction and does
work upon the pendulum bob. However, gravity is an internal force (or
conservative force) and thus does not serve to change the total
amount of mechanical energy of the bob. The other force acting upon
the bob is the force of tension. Tension is an external force and if
it did do work upon the pendulum bob it would indeed serve to change
the total mechanical energy of the bob. However, the force of tension
does not do work since it always acts in a direction perpendicular to
the motion of the bob. At all points in the trajectory of the
pendulum bob, the angle between the force of tension and its
direction of motion is 90 degrees. Thus, the force of tension does
not do work upon the bob.
Since there are no external forces doing work, the total
mechanical energy of the pendulum bob is conserved.
=Method=
=Method=
==Time==
==Time==
