lesson 4

Question 1

The term ______________ is used to denote the center of rotation of a body at some instant.

Answer 1

instant center

Question 2

An ___________ is (1) a point in one body about which some other body is rotating either permanently or at the instant; and (2) a point common to two bodies having the same linear velocity in both magnitude and direction in each. Both parts of this definition are important since we will make use of them in locating instant centers.

Answer 2

instant center

Question 3

instant centers that are fixed in the frame as the mechanism operates are called ___________.

Answer 3

fixed centers

Question 4

instant centers that move relative to the frame as the mechanism operates are called ___________.

Answer 4

moving centers

Question 5

_____________ states that any three bodies havinv plane motion relative to one another have three instant centers, and they lie on a straight line.

Answer 5

Kennedy’s theorem