RIESI, Administrators
3,664
edits
Changes
Jump to navigation
Jump to search
Line 1:
Line 1: + + Line 50:
Line 52: + + Line 112:
Line 116: − + − − Line 128:
Line 130: − Work done, is defined as a particular form of+ − product of two vectors – force and displacement. Such a product is − called the scalar product and the resulting quantity is a scalar. In − the context of work done, this is easy to understand. You don’t do − work in a particular direction – you just do work. − − The unit of work done is joules. 1 J of work is − said to be done when a force of 1 N causes a displacement of 1 m. − − − When work is done, it is done over a certain time. − The rate of doing work is defined as the power. Power is defined as − (work done)/ time taken. − − Power = work done/ time = force x displacement/ − time = force x velocity − − Its unit is Watt. Line 292:
Line 277: − + + + + Line 315:
Line 303: − + − + + Line 331:
Line 320: − Line 344:
Line 332: − + − + Line 354:
Line 342: − + − + Line 378:
Line 366: − + Line 1,799:
Line 1,787: − + − − − − − Line 1,889:
Line 1,872: − Line 1,912:
Line 1,894: + + + Line 1,953:
Line 1,938: + +
→Energy and the future
[[Category:Physics]]
= Introduction =
= Introduction =
= Work, Energy and Power =
= Work, Energy and Power =
TEST MATERIAL INPUT IN DIET URBAN WORKSHOP BY GURU
We often use the terms work in ordinary
We often use the terms work in ordinary
that the work done is the same in all the three cases above though
that the work done is the same in all the three cases above though
the force applied is different. Greater the angle of inclination,
the force applied is different. Greater the angle of inclination,
greater is the force needed.
greater is the force needed. Thus W = F x d if the distance travelled d is in
Thus W = F x d if the distance travelled d is in
the same direction as the force. If the direction in which the object
the same direction as the force. If the direction in which the object
is moving is at angle θ then the distance travelled in the direction
is moving is at angle θ then the distance travelled in the direction
for the bag.
for the bag.
W
=== Energy, types of energy-Kinetic and potential ===
=== Energy, types of energy-Kinetic and potential ===
<br>
<br>
[[Image:Energy%20for%20KOER_html_12d7d970.gif]]
<br>
=== Conservation of energy ===
=== Conservation of energy ===
==== Method: ====
==== Method: ====
[[Image:Energy%20for%20KOER_html_m72c98b84.png]]Use
[[Image:Energy%20for%20KOER_html_m72c98b84.png]]
the PhET simulation Pendulum Lab.
[http://phet.colorado.edu/en/simulation/pendulum-lab Use the PhET simulation Pendulum Lab]
the green rectangle which says “Run Now”.
the green rectangle which says “Run Now”.
==== Running the simulation ====
==== Running the simulation ====
# What do you think will happen to the pendulum next?
# What do you think will happen to the pendulum next?
Screenshot #2
'''Screenshot #2'''
[[Image:Energy%20for%20KOER_html_m4498abd8.png]]'''Questions:'''
[[Image:Energy%20for%20KOER_html_m4498abd8.png]]<br>'''Questions:'''
# What are the values of PE and KE as compared to total energy?
# What are the values of PE and KE as compared to total energy?
Screenshot #3
'''Screenshot #3'''
[[Image:Energy%20for%20KOER_html_706b8b67.png]] '''Questions:'''
[[Image:Energy%20for%20KOER_html_706b8b67.png]]<br> '''Questions:'''
# Look at the graph – what are the variables in the bar chart? Where has the thermal energy come from?
# Look at the graph – what are the variables in the bar chart? Where has the thermal energy come from?
# What do you expect will happen to the simple pendulum?
# What do you expect will happen to the simple pendulum?
==== Mechanics of the simple pendulum ====
==== Mechanics of the simple pendulum ====
= Energy and the future =
= Energy and the future =
The worldwide demand for energy is increasing day
The worldwide demand for energy is increasing day by day. The increasing use of modern means of transport-cars, buses,trains, aero planes , ships, etc., the rapid rise in the overall industrialization; the tremendous growth in population, particularly in the last 40 years, are some of the factors that have led to a tremendous spurt in mankind’s energy requirements. The biggest challenge/problem the world faces today is perhaps 'climate change' or 'global warming' which will lead to mass extinction of all life on earth. One of the major contributors to this is large use of fossil fuels (coal, petroleum) and moving to renewable energy sources is important. Read [http://www.nationofchange.org/2015/06/12/ditching-fossil-fuels-and-switching-to-100-renewables-no-problem-says-stanford-study article on how we can switch to alternative / renewable energy resources]
by day. The increasing use of modern means of transport-cars, buses,
trains, aero planes , ships, etc., the rapid rise in the overall
industrialization; the tremendous growth in population, particularly
in the last 40 years, are some of the factors that have led to a
tremendous spurt in mankind’s energy requirements.
energy produced.
energy produced.
= Evaluation: =
= Evaluation: =
# List some steps to minimize energy wastage
# List some steps to minimize energy wastage
= Teachers' Contributions =
= Additional web resources =
= Additional web resources =
Conservation of Energy, Thermodynamics, Biomass, Fossil Fuel,
Conservation of Energy, Thermodynamics, Biomass, Fossil Fuel,
Combined Cycle Power Generation</u>
Combined Cycle Power Generation</u>
----