Measurement: 1. Parallax method: If you hold a pen in front of your eye and look the tip of the pen by closing the right eye and then the left eye keeping right eye open, you observe that the position of the tip of the pen changes. This relative shift of the tip of the […]
Explore MoreDimension: All the physical quantities are derived from some fundamental quantities. Any physical quantity is expressed in terms of the product of different powers of the fundamental quantities. The exponent of fundamental quantities that represents the expression is called the dimension of that physical quantity. Consider a physical quantity speed = = = length (time)-1 […]
Explore MoreMoment of inertia: According to Newton’s first law of motion, if there is no external force is applied on a body, the body continuous in its state of rest or of uniform motion in a straight line. The property of the body by virtue of which it tends to resist the change its state of […]
Explore MorePower: power is defined as the time rate of doing work. P = = = = Fvcos. SI unit of power is watt = Nms-1 Dimension [P] = = = [ML2T-3]. 1 horse power (H.P.) = The amount of power is required to hold a mass of 550 lb for 1 second at a height […]
Explore MoreLaws of conservation of mechanical energy: It state that the total mechanical energy of a system remain constant if only conservative forces are acting on the system of particles and the work done by all other forces is zero. The initial potential and kinetic energy of the system are Ui and Ki respectively. The final […]
Explore MorePotential energy of spring: When a spring is compressed or elongated by a force F and the elongation or compression is x, then F x. Or, F = kx [where k is the force constant of spring] ——-(i) If Fe is the elastic force or restoring force applied by spring, then Fe = – kx […]
Explore MoreConservative and non-conservative field: A force is said to be conservative if the work done by or against the force in moving a body depends only on the initial and final position of the body not the nature of the path. Gravitational force, electrostatic force between two stationary charges, spring force etc. are conservative force. […]
Explore MoreWork energy theorem: Work done by all forces like conservative, non-conservative, external, internal acting on a particle is equal to the change in kinetic energy of it. Therefore, according to work energy theorem we can say that the work done by the resultant force acting on the particle (which is equal to the sum of […]
Explore MoreWork done by static friction: When static friction is acting between body and the surface, then there is no relative displacement between body and surface. Therefore static friction doesn’t perform any work. If a body is placed on a rough surface and force is applied on the body and we have to calculate the work […]
Explore MoreWork done by a variable force: If either the magnitude or direction or both the magnitude and direction of the applied force change, then we can say the force is variable. To calculate the work done by the variable force we have to consider the work done for an infinitesimal displacement i.e. dw = . . […]
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