The Sun is the biggest natural source of energy for us.
Explanation
Energy is defined as the capacity to do work. It is a fundamental physical quantity that exists in various forms, such as mechanical, thermal, chemical, and nuclear energy. The behavior of energy is governed by the law of conservation of energy, which states that energy can neither be created nor destroyed, only transformed.
Statement-wise Analysis
- Statement Energy is a vector quantity. is Incorrect: Energy is a scalar quantity. It possesses magnitude but does not have a specific direction, unlike vector quantities such as force, velocity, or displacement.
- Statement The Sun is the biggest natural source of energy for us. is Correct: The Sun is the primary and largest natural source of energy for the Earth. Solar radiation drives essential planetary processes, including the water cycle, wind patterns, and photosynthesis, which supports life and leads to the formation of biomass and fossil fuels.
- Statement Chemical energy cannot be converted into mechanical energy. is Incorrect: Energy transformation is a core principle of physics. Chemical energy is frequently converted into mechanical energy. A common example is an internal combustion engine in automobiles, where the chemical energy of fuel is converted into mechanical work to move the vehicle.
- Statement An object at rest cannot possess energy. is Incorrect: An object at rest can possess energy known as Potential Energy. This energy results from the object's position (e.g., water stored in a dam) or configuration (e.g., a compressed spring), independent of its motion.
Key Takeaway: Energy is a scalar quantity that can be transformed from one form to another (e.g., chemical to mechanical). The Sun is the ultimate source of almost all energy on Earth, and objects at rest can possess potential energy.