- #1
linnus
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When they say K=1/2mv^2 does K mean the change of kinetic energy? because Wtotal= the change of kinetic energy...
Understanding Energy and Kinetic Equations: A Quick Question Answered
- Thread starter linnus
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In summary, K=1/2mv^2 represents the kinetic energy of an object with mass m moving at velocity v. To determine the change in kinetic energy, one must solve for Kfinal - Kinitial, which is equivalent to the Wtotal. However, to calculate absolute K.E, an arbitrary value for the body at rest must be added to the difference. The most appropriate, logical, and convenient value for the body at rest may vary.
- #2
CaptainZappo
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linnus said:
1/2 mv^2 gives the kinetic energy of an object with mass m moving with velocity v. To find the change in kinetic energy, one would have to solve for Kfinal - Kinitial, which would be equal to the Wtotal of which you speak.
- #3
sadhu
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to calculate change in K.E we have formula 0.5*mass*(v*v-u*u)...
think about potential energy
we can calculate only change (d)
and arbitarily assume U at some point and express potential energy as
d+U(initial)=U(final).
actualy we can perform only relative analysis
and therefore diff of K.E of a moving body velocity v with respect to body at rest can be obtained by substituting u=0..
but to calculate absolute K.E we must take an arbitarily some value of K.E for body at rest...and then add it to the difference
and so what do you think is most appropriate, logical & convinient value to be given to the body at rest .??
well your question was good but a bit vague inexpression I think..
think about potential energy
we can calculate only change (d)
and arbitarily assume U at some point and express potential energy as
d+U(initial)=U(final).
actualy we can perform only relative analysis
and therefore diff of K.E of a moving body velocity v with respect to body at rest can be obtained by substituting u=0..
but to calculate absolute K.E we must take an arbitarily some value of K.E for body at rest...and then add it to the difference
and so what do you think is most appropriate, logical & convinient value to be given to the body at rest .??
well your question was good but a bit vague inexpression I think..
Last edited:
What is energy?
Energy is the ability to do work or cause change. It can take many forms, such as heat, light, electricity, and motion.
What is the difference between potential and kinetic energy?
Potential energy is the energy an object has due to its position or shape, while kinetic energy is the energy an object has due to its motion. Potential energy can be converted into kinetic energy and vice versa.
How is energy measured?
Energy is measured in joules (J) or calories (cal). Another common unit is the watt-hour (Wh), which is used to measure energy consumption over time.
What are the different sources of energy?
The main sources of energy are fossil fuels (such as coal, oil, and natural gas), renewable energy (such as solar, wind, and hydropower), and nuclear energy. Fossil fuels are non-renewable and have negative impacts on the environment, while renewable energy sources are sustainable and have minimal environmental impact.
How can we reduce our energy consumption?
There are many ways to reduce energy consumption, such as using energy-efficient appliances, turning off lights and electronics when not in use, using public transportation or carpooling instead of driving, and using renewable energy sources. Conserving energy not only helps the environment but also saves money on energy bills.
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