2mark Questions and Answers: UNIT 1 - BASICS OF
MECHANISMS
Part A questions:
- What is Kinematics?
Kinematics is the study
of motion (position, velocity, acceleration). A major goal of Understanding
kinematics is to develop the ability to design a system that will satisfy
Specified motion requirements. This will be the emphasis of this class.
- What is Kinetics?
Kinetics is the study of effect of forces on moving bodies. Good
kinematic design should produce good kinetics.
- Define Link.
A link is defined as a member or a combination of members of a
mechanism connecting other members and having relative motion between them. The
link may consist of one or more resistant bodies. A link may be called as
kinematic link or element. Eg: Reciprocating steam engine.
- Define Kinematic Pair.
Kinematic pair is a joint of two links having relative motion
between them. The types of kinematic pair are classified according to
Ø Nature of contact (lower
pair, higher pair)
Ø Nature of mechanical contact (Closed pair, unclosed pair)
Ø Nature of relative
motion (Sliding pair, turning pair, rolling pair, screw pair, spherical pair)
- Define Kinematic Chain
When the kinematic pairs are coupled in such a way that the last
link is joined to the first link to transmit definite motion it is called a
kinematic chain.
Eg: The crank shaft of an engine forms a kinematic pair with the
bearings which are fixed in a pair, the connecting rod with the crank forms a
second kinematic pair, the piston with the connecting rod forms a third pair
and the piston with the cylinder forms the fourth pair. The total combination
of these links is a kinematic chain. Eg: Lawn mower.
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