Mechanical Engineering - Engineering Mechanics - Discussion

According to the principle of conservation of energy, the total momentum of a system of masses in Straight line remains constant unless acted upon by an external force in that direction.

The question related to the Newtons Second law of motion, whereas the law of conservation of energy is different.

The rate of change of momentum is directly proportional to the applied force, as stated in the newtons second law of motion.

So, the answer is A(true).

That question is based on newton 1st law of motion. According to this law, every body that time up to not motion then not external force are applied.

Energy conservation should not be confused with linear momentum. Whilst one concerns itself with the fact that energy cannot be created or lost, the other is focused on changes that can happen within a system of masses moving in a particular direction when external forces are applied. Is there a change in system energy when momentum changes? Possibly.

Kinetic energy of a moving system of masses is 0.5 x (m1 x v1^2 + m2 x v2^2 x ......mn x vn^2). The mass of objects will not change unless some molecular distortion occurs which is not treated herein. However, the velocity can reduce or increase.

Hence, the system energy can go up or go down. However, if this is happening in a closed system, the kinetic energy lost becomes gained as heat energy. Hence, total energy remains unchanged. But if this is not a closed system, then energy is exchanged across our artificial boundary which contains the system of masses, and therefore system energy changes.

So, the key word here for the statement to be true is whether the system is CLOSED or OPEN. And, since we were not informed on this, the assumption is that it is an OPEN system in which case the correct answer is FALSE because the energy conservation principle will NOT hold in an OPEN system.

According to conservation of energy principle. Energy can neither be created nor be destroyed. It can only be transferred from one form to another.

According to conservation of energy principle. Energy cannot be created nor be destroyed. It can only be transferred from one source to another.

Energy conservation principle is it can't be created nor it can be destroyed we can consider system having heat stored in it now we can remove heat from system and can transfer to heat sink and we can add more to it from heat source into system but we can't destroy heat.

Principle of conservation of energy states that energy can neither be created nor destroyed. In another approach it can be stated as "the total energy of an isolated system remains constant.

It's all about law of conservation of energy.