The paradox of lost energy details below?

In summary, in the case of two bodies A & B with equal mass and speed traveling in different directions, their kinetic energies are equal. When they collide, they both stop and their kinetic energies become zero, but this does not violate the law of conservation of energy. Some energy is transformed into other forms, such as physical deformation, heat, and sound, while the total energy of the system remains constant.
  • #1
chanvick
1
0
Imagine two bodies A & B. they have same mass and same speed, but they are traveling in different direction. the kinetic energies of both the bodies is equal (1/2*mv^2), because they have same speed and mass. now they collide each other. As they have same mass and speed they both stop. now the kinetic energy of both the bodies is zero. but where is the kinetic energy gone...in other words what is it transformed into. but what about law of conservation of energy??
 
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  • #2
Welcome to PF!

Some is absorbed due to the physical deformation and some is released as heat and sound.
 
  • #3
chanvick said:
but what about law of conservation of energy??
Don't confuse general energy conservation--which includes all forms of energy--with special cases where mechanical energy may be conserved. Total energy is always conserved, but only in special cases will kinetic energy be conserved in a collision, making it a perfectly elastic collision.
 

FAQ: The paradox of lost energy details below?

What is the paradox of lost energy?

The paradox of lost energy refers to the concept that energy cannot be created or destroyed, but it can be lost or wasted. This paradox arises because energy is constantly being converted from one form to another, resulting in some energy being lost in the process.

What are some examples of lost energy?

Examples of lost energy include friction, heat, sound, and light. For instance, when a car is in motion, some of the energy from the fuel is converted into heat and sound, which are forms of lost energy.

Why is the paradox of lost energy important?

The paradox of lost energy is important because it highlights the need for efficient use of energy. With the growing concern for climate change and environmental sustainability, minimizing lost energy can help reduce the negative impact on the planet.

How can we reduce lost energy?

One way to reduce lost energy is by using energy-efficient technologies and practices. This can include using LED light bulbs, insulating buildings, and using renewable energy sources. Additionally, being mindful of energy usage can also help reduce lost energy.

What are the implications of the paradox of lost energy?

The paradox of lost energy has implications for various fields, including physics, engineering, and environmental science. It also has economic implications, as lost energy means wasted resources and higher costs. Understanding and addressing this paradox can lead to more efficient use of energy and a more sustainable future.

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