Author: Physics Notebook

  • State The Work-Energy Theorem.

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    Physics Notebook

    Work-energy theorem: Let us consider a particle is acted upon by a force , as a result the particle is displaced by a distance . Then the work done by the force on the particle is given by, Since the work done is the scalar product of two vectors force and displacement, so the work…

  • What Is Potential Energy?

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    Physics Notebook

    Potential energy: When an object is placed in some field, then the body possesses some amount of energy by virtue of its position or configuration, this energy is known as potential energy. A force field is conservative if and only if there exists a continuous differentiable scalar field in such a way that or equivalently…

  • What Is Kinetic Energy?

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    Physics Notebook

    Kinetic Energy; The kinetic energy of an object is the energy that the object possesses by virtue of its motion. For example, when a bullet is fired from a revolver, then the bullet can penetrate a target due to its kinetic energy. Expression for kinetic energy: Let us consider an object of mass be at…

  • What Is Power?

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    Physics Notebook

    Power: The time rate of doing work on a particle is called instantaneous power. Power is represented by the P as , where W is the work done by the force. If be the force acting on the particle and be the displacement of the particle, then since only the component of in the direction…

  • What Is Work?

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    Physics Notebook

    Work: When a force acting on a body, physically displaces the body through a distance in the direction of the force, then it is said that work is done by the force. So the work depends on two factors: The force acting on the body The displacement of the body along the direction of the…

  • What Is A Non-Conservative Force Field?

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    Physics Notebook

    Non-conservative force: If there is no scalar function V in such a way that , i.e. the force cannot be expressed as the gradient of a scalar function, then the force acting on the particle is called the non-conservative force. A force acting on a particle is said to non-conservative if the curl of the…

  • What Is Conservative Force Field?

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    Physics Notebook

    Conservative force field: Let us consider a particle is acted upon by a force , as a result the particle is displaced by a distance . Then the work done by the force on the particle is given by, Since the work done is the scalar product of two vectors force and displacement, so the…

  • What Is Newton’s Third Law Of Motion

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    Physics Notebook

    Newton’s 3rd law: To every action, there is always an equal and opposite reaction. If a particle 1 acts on particle 2 with a force in the direction along the line joining the particles, simultaneously particle 2 acts on the particle 1 with a force  , then we can write,   The 3rd law states…

  • What Is Newton’s Second Law Of Motion?

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    Physics Notebook

    Newton’s 2nd law: The rate of change of momentum is directly proportional to the impressed force and is in the same direction along which the force acts. The magnitude is referred in the first part of the law, and the direction is referred in the second part of the law. Let us consider a particle…

  • What Is Newton’s First Law Of Motion?

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    Physics Notebook

    Newton’s 1st law: Every body persists in a state of rest or of uniform motion along a straight line (i.e. with constant velocity) unless and until it is acted upon by an external force to change that state. Let us consider, be the vector sum of all the external forces acting on a particle and…