Force, Work, Energy & Power

second law of motion

  • Force-1

    An Apple Falling due to the effect of gravitational force

    Concept of force is fundamental to the study of Physics. It is important to analyze force to explain the various natural phenomena. So, be it the study of motion, gravitation or electromagnetism we have to deal with various forces and their causes.

    This course will teach you the variety of forces present in nature and their aplications in our life.

  • Force-2


    Force has various effects. It can have a translational effect or a rotational effect. The application of forces are different in different cases. After studying the translational effect of force, we will now explore the rotational effect of force.

    Rotational effect of force helps us to multiply the applied force and in this lecture we will study the rotational effect of force , Principle of moments and their simple applications.

  • Work, Energy, Power-1


    You can be dead tired while standing under the sun with a heavy luggage on your head. A physicist would say you are not doing any work. Silly !!

    Lets try to understand what is work and when will the Physicist say that you did some work atlast !!

    In this lecture you will study the fundamentals of work and energy.


    • Work Energy and Power and their relationship with force.
    • Definition of Work. W=F Cos θ, special cases of θ= 0,90. W=mgh.
    • Definition of energy, energy as work done.
    • Various units of work and energy and their relation with SI units [ erg, calorie, kWh and eV].
    • Definition of Power, P=W/t, SI and cgs units; other units, kilowatt (KW), megawatt (MW) and Gigawatt (GW) and horse power (1HP=746 W)
    • Simple numerical problem on work, power and energy.
    • Different types of energy (eg. chemical,mechanical, heat, electrical, nuclear, sound and light).
    • Mechanical energy: Potential energy, Kinetic energy, Gravitational energy.
    • Derivation of Kinetic Energy,
    • Kinetic energy in different forms: translational, rotational and vibrational (only simple examples).
    • Numerical problems on potential and kinetic energy only in case of translational motion.
    • Qualitative discussions of electrical, chemical, heat, nuclear, light and sound energy, conversion from one form to another; common examples.

  • Work, Energy, Power- 2

    conservation of energy

    The law of conservation of energy is an empirical law of physics. It states that the total amount of energy in an isolated system remains constant over time . A consequence of this law is that energy can neither be created nor destroyed; it can only be transformed from one state to another....

    Conservation of energy is an important concept in Physics and in this lecture you will learn how the enegy is conserved in various stages with the help of audio and videos.

  • Machines


    Machines are devices which multiplies or redirect the force applied. Hence if you are want to perform an work, it is easier to use an machine which will multiply the force applied hence the effort that is needed as an input will be less.
    This lecture explains you how force is multiplied by a simple machines, uses of lever and pulley.
  • Numerical Practice: Force, Work Power Energy, Machines


    This course gives you an exhaustive practise on numericals on all the chapters of Work, Force, Power and Energy. The numericals ae strictly as per ICSE pattern and have typical patterns of numericals. It is a must for ICSE class X students.