Mass (Definition)

Definition: It is the amount of matter contained in a given body, and does not very with the change in its position on the earths surface. The mass of the body is measured by direct compraision with a standard mass by using a level balance.
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Weight

Definition: It is the amount of pull, which the earth exerts upon a given body. Since the pull verys with distance of the body from the centre of earth, therefore the weight of the body will very with its position on the earth surface (say latitude and elevation)....
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Momentum

Definition: It is the total possessed by a body. Mathematically, Momentum=Mass x Velocity Where: m = mass of the body u = initial velocity of body v = final velocity of a body a = constant acceleration t = time required (in seconds) to change the velocity from...
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Moment of Force

Definition: It is the Turning effect produced by a force, on the body, on which it acts. The moment of force is equal to the product of force and the perpendicular distance of the point about which the moment is required and the line of action of the...
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Mass Moment of Inertia

Definition: It has been established since long that a rigid body is composed of small particles. if the mass of every particle of a body is multiplied by the square of its perpendicular distance from a fixed live, then the sum of these quantities (for the whole body)...
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Torque

Definition: It may be defined as the product of force and the perpendicular distance of its line of action from the given point or axis. A little consideration will show that the torque is equivalent to a couple acting upon a body.
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Kinematic Link or Element

Definition: Each part of a machine, which moves relative to some other part is known as a kinematic link ( or simply link ) or element. A link may consists several parts, which are rigidly fastened together, so that they don’t move relative to on an other. Types...
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Types of Links

In order to transmit motion, the driver and the follower may be connected by the following three types of links. 1. Rigid Link: A rigid link is one which does not undergo any deformation while transmitting motion, strictly speaking rigid links do not exists. However, as the deformation...
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What is Structure? (Definition)

Definition: It is an assemblage of a number of resistance bodies (known as member) having no relative motion b/w them and meant for carrying loads having straining action. A railway bridge, a roof trues machine frames etc are the example of structure.
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Difference between a Machine and a Structure

The following differences between a machine and a structure are important from the subject (Machine Design) point of view.   1. The parts of machine move relative to one another, whereas the members of a structure do not move relative to one another. 2. A machine transforms the...
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