The ability to do work is called energy.
2. What is the main source of energy for earth?
Sun is the main source of energy for earth.
3. What is the SI unit of energy?
Joules
4. Define potential energy.
The energy that is stored in an object because of its position is called potential energy.
5. Give some examples of potential energy
Any object that is at rest position has potential energy. For example, a book on a table, water in a lake, trees, and mountains have potential energy.
6. What is the formula for potential energy?
The formula for potential energy is
PE = mgh
Where,
m = mass of the object
g = acceleration due to gravity
h = height above the earth surface
7. List various types of potential energy
The various types of potential energy include
- Elastic potential energy
- Electric potential energy
- Chemical potential energy
- Nuclear potential energy
- Gravitational potential energy
The energy stored in an object because of its height above the ground is called gravitational potential energy.
9. Define elastic potential energy.
The energy stored in a stretched or compressed object is called elastic potential energy.
10. Define nuclear energy.
Nuclear energy is the potential energy of the particles such as neutrons and protons that are present inside the nucleus of an atom.
11. Define chemical energy.
The energy stored in the chemical bonds of atoms and molecules is called chemical energy.
12. Define electric potential energy.
Electric potential energy is a type of potential energy that a charged particle has because of its own electric charge and its relative position to other charged particles.
13. Define kinetic energy.
Kinetic energy is a type of energy that an object has because of its motion.
14. What is the formula for kinetic energy?
The formula for kinetic energy is
K = ½ mv2
Where,
m = mass of an object
v = velocity of an object
K = kinetic energy
15. List various types of kinetic energy.
The various types of kinetic energy include:
- Thermal energy
- Sound energy
- Radiant energy
- Electrical energy
Radiant energy is the energy of electromagnetic radiation.
17. Define thermal energy.
Thermal energy is the internal energy of an object due to the motion and collision of atoms.
18. Define sound energy.
The energy produced due to vibration of an object is called sound energy.
19. Define electrical energy.
An electrical energy is the energy of moving electrons.
20. List various forms of kinetic energy.
The various forms of kinetic energy include:
- Translational kinetic energy
- Vibrational kinetic energy
- Rotational kinetic energy
The sum of kinetic energy and potential energy is called mechanical energy.
22. Define law of conservation of energy.
The law of conservation of energy states that energy cannot be created or destroyed. However, it can be converted from one form to another form.
