Question

kinematics of machinery 16 marks with answers

Answer 1

. What is Kinematics?Kinematics is the study of motion (position, velocity, acceleration). A major goal ofUnderstanding kinematics is to develop the ability to design a system that will satisfySpecified motion requirements. This will be the emphasis of this class.2. What is Kinetics?Kinetics is the study of effect of forces on moving bodies. Good kinematic designshould produce good kinetics.3. Define Link.A link is defined as a member or a combination of members of a mechanismconnecting other members and having relative motion between them. The link mayconsist of one or more resistant bodies. A link may be called as kinematic link orelement. Eg: Reciprocating steam engine.4. Define Kinematic Pair.Kinematic pair is a joint of two links having relative motion between them. The typesof kinematic pair are classified according toNature of contact (lower pair, higher pair)Nature of mechanical contact (Closed pair, unclosed pair)Nature of relative motion (Sliding pair, turning pair, rolling pair, screw pair,spherical pair)5. Define Kinematic ChainWhen the kinematic pairs are coupled in such a way that the last link is joined to thefirst 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 arefixed in a pair, the connecting rod with the crank forms a second kinematic pair, thepiston with the connecting rod forms a third pair and the piston with the cylinderforms the fourth pair. The total combination of these links is a kinematic chain. Eg:Lawn mower.