Mechanical Engineering - Engineering Mechanics - Discussion

According to the conservation of energy, the energy can neither be created nor be destroyed but it can only transfer from one system to another or one form to another form.

False is the correct answer.

The principle described in your statement is the principle of conservation of momentum**, not energy. According to the principle of conservation of momentum, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

The principle of conservation of energy states that the total energy of an isolated system remains constant over time.

False.

The principle you mentioned seems to be a mix-up of two different concepts: the conservation of energy and the conservation of momentum.

The principle of conservation of momentum states that the total momentum of an isolated system of objects remains constant if no external forces act on it. This means that in the absence of external forces, the total momentum of the system in any direction remains the same.

The conservation of energy, on the other hand, states that the total energy of an isolated system remains constant over time, and energy can be transferred or transformed but not created or destroyed.

So, the correct statement would be: According to the principle of conservation of momentum, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

The principle of Conservation of energy is the 1st Law of thermodynamics.

Thanks all for giving explanations.

I think the given Statement is not correct.

There should be momentum conservation. And according to the principle of conservation of momentum, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

No, the statement is False. The principle of conservation of energy states that the total energy of a closed system is constant, it does not say anything about the momentum of a system of masses. The law of conservation of momentum states that the total momentum of a closed system of masses remains constant unless acted upon by an external force in that direction. So, momentum is conserved, not energy.

For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.

Momentum is mass x vel.. When the force applied in any direction or here in that direction, energy is added & velocity will increase. so the momentum will increase & hence change.
So the answer should be: True.

Correct me if I am wrong.

It states that the total amount of energy in an isolated system remains constant over time. The total energy is said to be conserved over time. For an isolated system, this law means that energy can change its location within the system, and that it can change form within the system, for instance chemical energy can become kinetic energy, but that energy can be neither created nor destroyed.