^Non-conservative force
^Non-conservative force Friction, viscous drag. Mechanical energy is dissipated.
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^Conservative forces
^Conservative forces Gravitational, electromagnetic & spring. Mechanical energy (= K + U) is conserved.
^Pendulum in accelerated frame
^Pendulum in accelerated frame Suppose a simple pendulum is hanging in a truck speeding up horizontally tight side with acceleration ‘a’ w.r.t. stationary ground, then From the ground frame Tsinθ gives the pendulum x acceleration (a) i.e. Tsinθ = ma Tcosθ balances the weight of the pendulum i.e. Tcosθ = mg From the truck frame […]
^Weight in a lift
^Weight in a lift Consider a person 1 of mass m (true weight, mg) standing on a weighing scale placed on the floor of a lift. The reading (R) of weighing scale is called his apparent weight, the scale by the person. Let the lift is speeding up with acceleration ‘a’ w.r.t. a stationary ground […]
^A horizontal rod pulled
^A horizontal rod pulled
^A block hanging on two strings
^A block hanging on two strings
^A block hanging on two strings
^A block hanging on two strings
^Tension, T
^Tension, T Restoring force developed in wires, sheets & rods is called tension force. It is equals to reaction of net pull.
^Lemi’s theorem
^Lemi’s theorem It is used to solve situations based on Equilibrium of three concurrent coplanar forces. Let F1, F2 & F3 the three concurrent coplanar forces in equilibrium at point O as shown in the diagram. Then using Lemi’s theorem we can write:
^Static equilibrium
^Static equilibrium A body at rest is called static equilibrium. However momentary rest is not equilibrium. e.g. a projectile at its highest point or an oscillating body at its extreme position are at rest (momentary) thus not in equilibrium.
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