Centre Instantané De Rotation Flashcards
(24 cards)
What does CIR stand for in mechanical engineering?
CIR stands for Instantaneous Center of Rotation.
True or False: The instantaneous center of rotation is a fixed point for a moving body.
False.
Fill in the blank: The instantaneous center of rotation is the point in a body where the _______ is zero.
velocity
What is the significance of the instantaneous center of rotation?
It helps in analyzing the motion of rigid bodies and simplifying the calculation of velocities.
How can you find the instantaneous center of rotation for a two-dimensional motion?
By constructing perpendicular lines to the velocity vectors at two points on the body.
Multiple Choice: Which of the following is NOT a characteristic of the instantaneous center of rotation? A) It can change position. B) It is always at the center of mass. C) It can be outside the body.
B) It is always at the center of mass.
What happens to the instantaneous center of rotation when the body is in pure translation?
The instantaneous center of rotation moves to infinity.
True or False: The instantaneous center of rotation can be used to determine angular velocity.
True.
What is the relationship between linear velocity and angular velocity at the instantaneous center of rotation?
Linear velocity is equal to the angular velocity multiplied by the distance from the instantaneous center.
Fill in the blank: The instantaneous center of rotation can be used to simplify the analysis of _______ motion.
curvilinear
What is the role of the instantaneous center in the analysis of mechanisms?
It allows for the transformation of complex motion into simpler rotational motion.
Multiple Choice: Which method can be used to locate the instantaneous center of rotation? A) Kinematic analysis. B) Dynamic analysis. C) Energy analysis.
A) Kinematic analysis.
True or False: The instantaneous center of rotation is always located within the object.
False.
What is the formula to calculate the radius of curvature at the instantaneous center of rotation?
The radius of curvature is the distance from the instantaneous center to the point of interest.
Fill in the blank: In a planar motion, the instantaneous center can be determined from the intersection of the _______ of the velocity vectors.
perpendiculars
What is the first step in analyzing a rigid body using the instantaneous center of rotation?
Identify the points on the body and their respective velocities.
Multiple Choice: What is a common application of the concept of instantaneous center of rotation? A) Fluid dynamics. B) Robotics. C) Thermodynamics.
B) Robotics.
True or False: The instantaneous center of rotation can be visualized as a pivot point for rotational motion.
True.
What does a change in the instantaneous center of rotation indicate about the motion of the body?
It indicates a change in the direction or type of motion.
Fill in the blank: The instantaneous center of rotation is particularly useful for analyzing _______ mechanisms.
linkage
What is the effect of friction on the instantaneous center of rotation?
Friction can alter the motion and, consequently, the position of the instantaneous center.
True or False: The instantaneous center of rotation remains constant during motion.
False.
What is the key advantage of using the instantaneous center of rotation in mechanical analysis?
It simplifies the calculation of forces and velocities in complex systems.
Multiple Choice: In a three-dimensional motion, how does the concept of instantaneous center of rotation change? A) It becomes irrelevant. B) It remains the same. C) It becomes more complex.
C) It becomes more complex.
