The correct answer is Energy.
- Energy can neither be created nor be destroyed.
Key Points
- First Law of Thermodynamics:
- It is also known as the Law of Conservation of Energy and states that energy cannot be created or destroyed in an isolated system.
- Thermodynamics was discovered by Ludwig Boltzmann.
- Albert Einstein also said that "Energy cannot be created or destroyed. It can only be changed from one form to another."
Additional Information
- Force is that external cause which when acts on a body, changes or tries to change the initial state of the body.
- Force = mass × acceleration
- Its S.I. unit is Newton (kg. m s-2)
- Momentum is the property of a moving body and is defined as the product of mass and velocity of the body.
- It is a vector quantity.
- Its SI unit is kg m/s.
- The rate of doing work is called power.
- SI unit of power is watt or Joule Per second named as a respect to the scientist James Watt.
- It is a scalar quantity.
