Q: State the law of conservation of energy.
A: Energy can neither be created nor destroyed; it can only be converted from one form to another.
Q: What is 1 Watt equal to?
A: 1 Watt equals 1 Joule per second (1 W = 1 J/s).
Q: What is mechanical energy?
A: Mechanical energy is the sum of kinetic energy and potential energy.
Q: Name two forms of energy.
A: Mechanical energy and heat energy (any two valid forms acceptable).
Q: When does an object possess kinetic energy?
A: An object possesses kinetic energy when it is in motion.
Q: What happens to the potential energy of a freely falling object?
A: The potential energy decreases as the object falls.
Q: What is the relationship between work and energy?
A: Work done equals the change in energy.
Q: Define 1 Joule of work.
A: 1 Joule is the work done when a force of 1 Newton displaces an object by 1 meter in the direction of force.
Q: When is work done considered positive?
A: Work is positive when force and displacement are in the same direction.
Q: What is the formula for power?
A: Power = Work done/Time taken (P = W/t).
