Principles

Question 1

Principle of conservation of energy

Answer 1

Energy cannot be created or destroyed, it can only be transfered from one form to another

Question 2

Principle of momentum

Answer 2

Provided there is no external forces acting on a system, the total moment remains the same

Question 3

Principle of moments

Answer 3

For a body in equilibrium the clockwise moments at an point is equal to the total anticlockwise moments about the same point.