Test: Velocity & Acceleration Analysis - 1 - Mechanical Engineering MCQ

velocity = lω

  = ω x AB

If three plane bodies have relative motion among themselves, their I-center must lie on a straight line, this is known as Kennedy’s theorem.

In a sliding motion, the I-center lies at infinity in a direction perpendicular to the path of motion of the slider. The sliding motion is equivalent to a rotary motion of the links with the radius of curvature as infinity.

A body has a plane motion, if all its points move in planes which are parallel to some reference plane. A body with plane motion will have only three degree of freedom. Hence the correct answer is 4.

E i s instantaneous center for the link A B and C D and angular velocity for the point B and C would be same about E

A centrode is the locus of the I-center of a plane body relative to another plane body for the range of motion specified or during a finite period of time.
Space centrode (or fixed centrode) is the locus of the I-center of the moving body relative to the fixed body.
Body centrode (or moving centrode) is the locus of the I-center of the fixed body relative to the movable body.