Question

State the laws of conservation of linear momentum and mechanical energy.

Answer 1

The law of conservation of linear momentum states that if no external forces act on the system of two colliding objects, then the vector sum of the linear momentum of each body remains constant and is not affected by their mutual interaction.

The law of conservation of energy is an empirical law of physics. It states that the total amount of energy in an isolated system remains constant over time (is said to be conserved over time). A consequence of this law is that energy can neither be created nor destroyed: it can only be transformed from one state to another.

Answer 2

conservation of linear momentum -

A conservation law stating that the total linear momentum of a closed system remains constant through time, regardless of other possible changes within the system

conservation of  mechanical energy -

According to the law of conservation of mechanical energy, the mechanical energy of an isolated system remains constant in time, as long as the system is free of friction and other non-conservative forces

Answer 3

The law of conservation of linear momentum states that if no external forces act on the system of two colliding objects, then the vector sum of the linear momentum of each body remains constant and is not affected by their mutual interaction.

According to the law of conservation of mechanical energy, the mechanical energy of an isolated system remains constant in time, as long as the system is free of friction and other non-conservative forces.

Answer 4

the linear momentum of a system remains constant when it is not acted upon by an external force

the energy of the system is constant,, i.e. T E = PE + KE =constant ( ignoring frictinal, heat and sound losses)

Answer 5

The law of conservation of linear momentum states that if no external forces act on the system of two colliding objects, then the vector sum of the linear momentum of each body remains constant and is not affected by their mutual interaction.

According to the law of conservation of mechanical energy, the mechanical energy of an isolated system remains constant in time, as long as the system is free of friction and other non-conservative forces. In any real situation, frictional forces and other non-conservative forces are present, but in many cases their effects on the system are so small that the law of conservation of mechanical energy can be used as a fairapproximation. Though energy cannot be created or destroyed in an isolated system, it can be converted to another form of energy.