What is Machine ?
A machine is a mechanism or combination of mechanism which apart from imparting define motion to the path also transmit and modify the available mechanical energy into the come kind of useful work.
What is Mechanism ?
If the number of body/part are assembled in such a way that the motion of one case constrained and predictable motion to other.
What is Resistant body ?
A body is said to be resistant if it is capable of transmitting the required. force with negligible deformation. These bodies are the parts of the machines which are used for transmitting motion and forces. It is a theoretical concept which is accepted. Though practically speaking, there is some deformation in the body while transmitting the motion or force. A link need not necessarily be a rigid body, but it must be a resistant body. For example, springs, belts and oil used in hydraulic press are not rigid links ; but they are resistant bodies.
What is Rigid body ?
A body is said to be rigid if under the action of force, it does not suffer any distortion or the distance between any two point on it remains constant.
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