Mechanical Engineering - Engineering Mechanics - Discussion
Discussion Forum : Engineering Mechanics - Section 1 (Q.No. 1)
1.
According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
Discussion:
98 comments Page 8 of 10.
Abhishek Chandrakar said:
1 decade ago
According to principle of energy conservation, energy can't be created can't be destroyed. The definition not belongs to the statement.
Nikhil said:
1 decade ago
For the momentum we need mass and the movement of the mass so it is the phenomenon which deals with the moving mass interaction and also a continuous change which can never be constant. Because momentum = mass *ds/dt and ds/dt term is a continuous change of displacement with respect to time.
Mayukh said:
1 decade ago
The statement is newton's second law not law of conservation of energy.
Rohit said:
1 decade ago
Principle of conservation of energy states that energy can neither be created nor be destroyed.
Sunil said:
1 decade ago
According to conservation of energy: Energy neither created nor destroyed but it can change one form to another.
Chandra deep said:
1 decade ago
It's all about law of conservation of energy.
Rahul Thakur said:
1 decade ago
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.
Krunal Patil said:
1 decade ago
Momentum changes with gravity, and gravity changes from place to place.
Divyanshu said:
1 decade ago
Momentum doesn't need constant force, if a body is accelerating in a direction then there must be a constant force applied on it, also the question is asking about SYSTEM OF MASSES, of which momentum can be changed in a by applying force in any direction & not in particularly that direction.
Vemburaj said:
1 decade ago
If a body has some constant momentum in one direction, it means that a constant external force is acting on it. But if the momentum has to change in magnitude in that direction then an external unbalanced force has to act.
Here only external force is given and not external unbalanced force hence answer is false.
Here only external force is given and not external unbalanced force hence answer is false.
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