Energy
Energy: Overview
In this topic, we will learn about kinetic energy and potential energy. Here we will learn that energy cannot be destroyed. Instead, it can be possessed by an object.
Important Questions on Energy
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
An object of mass is raised to a height of above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when the object is halfway down.
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
What are the various energy transformations that occur when you are riding a bicycle?
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
A battery lights a bulb. Describe the energy changes involved in the process.
The kinetic energy of an object of mass, moving with a velocity of is . What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
Write an expression for the kinetic energy of an object.
What is the kinetic energy of an object?
