Energy in Daily Life Note Class 6

 

Energy in Daily Life

Very Short Questions

1.       What is energy?
Energy is the ability to do work.

2.       Define potential energy.
Potential energy is a form of energy that an object possesses by virtue of its position.

3.       Define kinetic energy.
Kinetic energy is a form of energy that an object possesses by virtue of its motion.

4.       What is the role of energy in doing work?
The role of energy in doing work is to enable an object to move.

5.       What is mechanical energy?
Mechanical energy is the energy possessed by an object due to its motion or position.

6.       Name the type of energy present in the following objects:
Fig(a) – Kinetic energy
Fig(b) – Potential energy

7.       Give an example of an object with potential energy.
An example of an object with potential energy is water stored in a dam.

8.       Give an example of an object with kinetic energy.
An example of an object with kinetic energy is a moving car.

9.       What is energy transformation?
The process of conversion of energy from one form to another is called energy transformation.

10.  Give an example of energy transformation in everyday life.
An example of energy transformation in everyday life is a bulb converting electric energy into light energy.

11.  What is the law of conservation of energy?
The law of conservation of energy states that energy can neither be created nor be destroyed but can be changed from one form to another.

12.  Give an example of the law of conservation of energy.
An example of the law of conservation of energy is swinging pendulum.

13.  What type of energy does a running river possess?
A moving car possesses kinetic energy.

Short questions

1.       What is energy? Write down the various forms of energy.
Energy is the ability to do work. The various forms of energy are:
i) Electric energy                 ii) Light energy
iii) Heat energy                     iv) Sound energy

2.       Write down any four examples of potential energy.
The four examples of potential energy are:
i) A stretched rubber                                       ii) A compressed spring
iii) A hanging apple                                          iii) Water stored in a dam

3.       Provide any two examples of mechanical energy.
The two examples of mechanical energy are:
i) A moving car                     ii) Water stored in a dam

4.       Differentiate between potential energy and kinetic energy.

Potential energy	Kinetic energy
14.  Potential energy is a form of energy that an object possesses by virtue of its position.	15.  Kinetic energy is a form of energy that an object possesses by virtue of its motion.
Its formula is PE=mgh	Its formula is KE= mv2
For example: An stretched rubber, water stored in a dam, etc.	For example: A moving car, a fired bullet, etc.

5.       Explain the relationship between the mass and kinetic energy of an object.
The kinetic energy of an object is directly proportional to its mass. This means that if the mass increases, the kinetic energy also increases when the velocity is the constant.

6.       How does the velocity of an object affect its kinetic energy?
Kinetic energy is directly proportional to the velocity. This means when the velocity increases, the kinetic energy increases, and when the velocity decreases, the kinetic energy also decreases.

7.       Discuss the importance of energy conservation in our daily lives.
The importance of energy conservation in our daily lives are:
i) Energy conservation saves natural resources for future use.

ii) It reduces pollution and helps protect the environment.

8.       Not necessary

9.       Give any four examples of transformation of energy?
The four examples of transformation of energy are:
i) Electrical energy to Light Energy (Light Bulb)
ii) Chemical to Thermal Energy (Burning Wood)
iii) Mechanical to Sound Energy (Ringing Bell)
iv) Electrical to Mechanical Energy (Electric Fan)

10.  What are the factors that affect kinetic energy?
The factors that affect kinetic energy are mass and velocity.

Long questions

3. Study the given figure and answer the following questions:

i) Name the type of mechanical energy present in fig(a) and (b). Also , give reason for each.
The type of mechanical energy present in fig(a) is Kinetic Energy, because the object is moving.
The type of mechanical energy present in fig(b) is Potential Energy, because the water stored in the dam has energy due to its height and position.

ii) Write any two differences between the form of energy shown in fig(a) and fig(b).

Potential energy	Kinetic energy
Potential energy is a form of energy that an object possesses by virtue of its position.	Kinetic energy is a form of energy that an object possesses by virtue of its motion.
Its formula is PE=mgh	Its formula is KE= mv2