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VR Tour For Std. 9 Ch. 11. Work and Energy

What's Included in Virtual tour of this chapter

We will understand about Work, unit of work, and sign conventions for work done. Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. The unit of work is joule or newton-meter. The capacity of a body to do work is called the energy of the body. The law of conservation of energy states that energy can neither be created nor destroyed, it can only be transformed from one form to another or transferred from one object to another. We will also learn about what is Power in this virtual tour.

Virtual tour 1 What is Work

Virtual tour 1: What is Work?

Work is expressed as the product of force and displacement in the direction of the force. The equation of work would be Work W is equal to Force F is multiplied by Displacement S. Two conditions need to be satisfied with the work to be done. One is the Force should act on the object and the other is Object must be displaced.

Virtual tour 2 The Energy

Virtual tour 2: The Energy

The capacity of a body to do work is called the energy of the body. The energy is transferred from one body to another. The SI unit of energy is the joule. The energy depends on the work. An object that has the capability to do work is said to possess energy. The object which does the work loses energy and the object on which the work is done gains energy.

Virtual tour 3 Forms of Energy

Virtual tour 3: Forms of Energy

Kinetic energy is the energy that an object has because of its motion. The kinetic energy of an object increases with its speed. When the wind blows past a wind turbine, its blades capture the wind’s kinetic energy and rotate itself.

Virtual tour 4 The Potential Energy

Virtual tour 4: The Potential Energy

Potential energy is defined as mechanical energy, stored energy, or energy caused by its position. An object that gains energy may store it in itself as potential energy. In other words, the potential energy possessed by the object is the energy present in the object by virtue of its position or configuration.

Virtual tour 5 The Law of conservation of Energy

Virtual tour 5: The Law of conservation of Energy

The law of conservation of energy states that the total energy of an isolated system remains constant. It is said to be conserved over time. This law means that energy can neither be created nor destroyed. Rather, it can only be transformed or transferred from one form to another.

Virtual tour 6 Potential energy of an object at a height

Virtual tour 6: Potential energy of an object at a height

The potential energy of objects keeps decreasing. When the object is about to reach the ground, and the kinetic energy of objects keeps increasing when we throw them from height to the ground. The kinetic energy would be largest and potential energy would be least.

Virtual tour 7 The Power

Virtual tour 7: The Power

Power is the rate at which work is done or energy converted. Power decreases as the time increases to do some work. The SI unit of power is the watt. 1 W = 1 J/s. and the energy used in one hour at the rate of 1kW is called 1 kW h.