TECHNICAL TERMS OF ENGINEERING MECHANICS EXPLAINED !!

1.)ANGULAR ACCELERATION – The time rate of change of angular velocity.

2.)ANGULAR VELOCITY – The time rate of change of angular displacement of a point rotating about a fixed axis (expressed in radians per unit time) Angular velocity of a machine part is often expressed in revolutions per minute (RPM) and is denoted by n.

3.)CENTRIFUGAL FORCE – Radial outward force acting on a body moving along a circular path with uniform velocity.

4.)CENTRIPETAL FORCE – The force that must act radially inward in order to constrain a particle to follow a curved path at uniform velocity.

5.)DEAD WEIGHT GOVERNOR – The governor in which the radius of the ball path is controlled by levers and weights, the latter being usually attached to the control sleeve.

6.)DYNAMOMETER – A device for measuring the forces or couples which tend to change the state of rest or of uniform motion of a body.

7.)FLOATING LINK – A link in a mechanism which does not have a fixed center of rotation (e.g., coupler in a four bar linkage).

8.)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.

9.)INVOLUTE TEETH – The outline of a tooth traced out by a point on a chord unwrapped from a circle (known as base circle).

10.)KENNEDY’S THEOREM – Any three bodies having plane motion relative to one another have three instant centers, and they lie in a straight line.