Question

Given below are two statements:

Statement (I): A kinematic link may consist of several parts rigidly fastened together so that they do not move relative to one another.

Statement (II): A kinematic link need not be a rigid body but it must be a resistant body.

In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are true.
• B. Both Statement (I) and Statement (II) are false.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

Recall the standard textbook definition of a kinematic link and what "resistant body" means.

Answer 1

The Correct Option is A

Step 1: Statement (I) says a kinematic link may consist of several parts rigidly fastened together so that they do not move relative to one another. This matches the standard definition, since a single link can be built from more than one physical part as long as those parts move together as one rigid unit, for example a connecting rod pressed together with its two bearings. So Statement (I) is true.

Step 2: Statement (II) says a kinematic link need not be a rigid body but it must be a resistant body. A resistant body is one that is firm enough to transmit the required force during motion without failing, even if it is not perfectly rigid in the strict sense. This is also part of the accepted definition of a link. So Statement (II) is true.

Since both statements match the accepted definition of a kinematic link, the correct choice is option 1, both Statement (I) and Statement (II) are true.