TECHNICAL TERMS OF MECHANICS OF MACHINES !!

1.)HIGHER PAIRS – Types of kinematic pairs, namely, two elements generally
have line or point contact and the pair must be force closed in order to provide completely constrained motion

2.)INTERMITTENT MOTION MECHANISM – A linkage which converts continuous motion into intermittent motion (e.g., indexing mechanism).

3.)INVOLUTE – The locus of a point on a straight line which rolls, without slipping, on the circumference of a circle, or alternatively the locus of a point on the chord which is held taught and unwound from a cylinder.

4.)RELATIVE MOTION – A body has motion relative to another body only if there is a difference in their absolute motions.

5.)RESOLUTION OF VECTORS – Resolution refers to the breaking down of a vector into any number of component vectors.

6.)SCALAR QUANTITIES – Those quantities which have magnitude only (and no direction) e.g., distance, area, volume and time.

7.)SENSITIVITY OF GOVERNOR – Ratio of the mean speed to the speed range of the governor over its limits of operation.

8.)SKEW GEARING – Gearing arrangement in which the axes of the shafts connected by gears are non parallel and non intersecting.

9.)SLIDING CONTACT – Sliding exists in a direct contact mechanism whenever the bodies have relative motion along the tangent through their point of contact.

10.)VECTOR QUANTITIES – Those entities which have magnitude and direction. (e.g., displacement, velocity, acceleration and force). Vector quantities are represented by a straight line with an arrow head (magnitude is represented by its length and direction by the arrow head).