We have seen the various types of
motions which may be undergone by particles and rigid bodies. You may be able
to understand the relationships of displacement, velocity and acceleration while
a particle is moving along a straight path. The acceleration of the particle can
be uniform or may be variable. A special type of linear motion called simple
harmonic motion is also studied by you and we are aware that this is a
repetitive type of motion.
A particle can move along a circular
path with uniform or variable velocity. We have studied the methods by which we
can calculate tangential and normal components of accelerations. A special type
of curvilinear motion is called as projectile in which the path is parabolic
and is called as trajectory.
A rigid body motion can be
translatory or rotational about a fixed axis and can cause velocity and
acceleration at different points in the body. A plane motion is a combination
of these two motions. To calculate velocity in plane motion we may use
instantaneous centre technique velocity diagram method. Furthermore,
acceleration in plane motion can be calculated if we know the angular
acceleration of the body.
Several times, the axes of reference
are not fixed. The same are connect to a body called vehicle which moves and
observations are built by the observer standing on the vehicle. Thus relative
motion and relative velocity can be evaluted.
The kinematics part of dynamics of
bodies is extremely important for understanding the motions and the forces
which are responsible for causing the motions.
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