Work, Energy & Power || Lecture - 01 || Manish Raj Sir || Class 11 || Physics || NEET
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Work
Work is defined as the product of force and displacement. Mathematically, work (W) is given by the equation:
W = F * d * cos(theta)
where F is the force applied, d is the displacement, and theta is the angle between the force vector and the displacement vector. The SI unit of work is joule (J).
Work can be positive, negative, or zero. When a force is applied in the same direction as the displacement, the work done is positive. When the force is applied in the opposite direction to the displacement, the work done is negative. If the force and displacement are perpendicular, the work done is zero.
Energy
Energy is the ability to do work. There are different forms of energy, including kinetic energy, potential energy, and thermal energy.
Kinetic energy is the energy possessed by a moving object. It is given by the equation:
KE = 1/2 * m * v^2
where m is the mass of the object and v is its velocity.
Potential energy is the energy possessed by an object due to its position or configuration in a gravitational or electric field. It is given by the equation:
PE = mgh
where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.
Thermal energy is the energy possessed by a system due to its temperature. It is related to the kinetic energy of the particles in the system.
Energy is conserved in a closed system, which means that the total energy of the system remains constant. This is known as the law of conservation of energy.
Power
Power is the rate at which work is done. Mathematically, power (P) is given by the equation:
P = W/t
where W is the work done and t is the time taken to do the work. The SI unit of power is watt (W).
In summary, work, energy, and power are fundamental concepts in physics that are important for the NEET exam. Work is defined as the product of force and displacement, energy is the ability to do work, and power is the rate at which work is done. These concepts are interrelated and are crucial for understanding the behavior of physical systems.
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