Question 13 Marks
(a) What is energy? State and define SI unit of energy.
(b) Define potential energy with an example.
(c) Define kinetic energy with an example
(b) Define potential energy with an example.
(c) Define kinetic energy with an example
Answer
View full question & answer→(a) The capacity of a body to do work is called energy. SI unit of energy is joule. When one newton force causes a displacement of one metre in its own direction, the energy spent is said to be one joule.
(b) Potential energy is the amount of energy possessed by a body by virtue of its position or configuration.
Example : When the spring of a watch is wound, its configuration changes. Thus, the spring possesses potential energy
(c) Kinetic energy is the energy possessed by a body by virtue of its motion.
Example: Energy possessed by a train moving on rail track.
(b) Potential energy is the amount of energy possessed by a body by virtue of its position or configuration.
Example : When the spring of a watch is wound, its configuration changes. Thus, the spring possesses potential energy
(c) Kinetic energy is the energy possessed by a body by virtue of its motion.
Example: Energy possessed by a train moving on rail track.