Module 5 Flashcards
rotation motion
all particles of a rigid body move in concentric circular path about a fixed point or axis
angular displacement
displacement of particle in circular motion
angular velocity
rate of change of angular displacement with time
angular acceleration
rate of change of angular acc with time
work energy principle
work done by a torque acting on a body during an angular displacement is equal to the change in KE of the body during the same displacement
instantaneous centre of rotation
the point about which body can be assumed to be rotating at a given instant
centrode
locus of instantaneous centre as the body goes on changing its position
properties of instantaneous centre
1) mag of velocity at any point on a body is perpendicular to its distance from the instantaneous centre and is equal to the angular velocity times distance
2) the direction of velocity at any point on the body is perpendicular to the line joining that point and the instantaneous centre
periodic motion
any motion that repeats after equal intervals of time
conditions to be satisfied for a motion to be simple harmonic motion
1) the acc should be proportional to the distance of the body from a fixed point called centre of SHM
2) the acc should always be directed towards the mean position
amplitude
max displacement of particle from mean position
oscillation
motion of projection of particle along the diameter
period
time for one oscillation
restoring force
the force that tends to bring the system back to its eqm position
degree of freedom
number of independent coordinates required to define the configuration of the system
