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Note for ENGINEERING MECHANICS - EM By Vinod B Shikhare

  • ENGINEERING MECHANICS - EM
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  • Dr, Babasaheb ambedkar marathwada university - GECA
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Force System Engineering Mechanics: It is branch of science which deals with the study and effect of forces acting on the body in motion or at rest. Classification of Engineering Mechanics: Engineering Mechanics Statics Dynamics Kinetics Kinematics Statics: Statics is that branch of Engineering Mechanics which deals with the study and effect of forces acting on the body at rest. Dynamics: Dynamics is that branch of Engineering Mechanics which deals with the study and effect of forces acting on the body in motion. Kinetics: Kinetics is that branch of dynamics which deals with the bodies in motion when forces causing the motion are considered. Kinematics: Kinematics is that branch of dynamics which deals with the bodies in motion when forces causing the motion are NOT considered. Space: The geometric region in which study of body is involved is called space. Prof. Vinod B Shikhare Page 1

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Force System Particle: Particle is a point mass which has no dimensions. It has a mass occupying definite space. Total mass of the body acts at a certain point within the body in downward direction and this point is called as center of the mass. Body: It is a portion of matter which has dimensions. It has a mass occupying definite space. Classification of Body: Body Rigid Body Deformable Body Elastic Body Plastic Body Rigid Body: A body which does not changes its shape and size after the application of external force on it, is called as rigid body. Deformable Body: A body which changes its shape and size after the application of external force on it is called as deformable body. Elastic Body: A body which regains its original shape and size when external forces acting on it are removed is called as elastic body. Plastic Body: A body which does not regains its original shape and size when external forces acting on it are removed is called as plastic body. Force: An external agency which tends to change the state of rest or of uniform motion is called as force. Force is a vector quantity since it has both magnitude and direction. Prof. Vinod B Shikhare Page 2

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Force System Characteristics of Force: 1. Magnitude 2. Direction 3. Point of Application 4. Nature 1. Magnitude The quantum of a force is known as its magnitude. For example a force of 100 N means magnitude of force is 100 N. 2. Direction The line of action along which force acts is known as its direction. The angle made by to force with respect to any reference axis is known as its direction. 3. Point of application The point at which a force acts is known as its point of application. 4. Sense or Nature Sense or nature of a force is indicated by and arrowhead. Arrowhead indicates whether it is a push or full force. Effects of force Force acting on the body may i. Bring the body in a state of rest ii. Start the body in motion iii. Accelerate the body iv. Retard body v. Change shape and size of body vi. Keep the body in equilibrium Force System Two or more forces acting on a body is called as force system. Prof. Vinod B Shikhare Page 3

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Force System Classification of Force System Coplanar Forces If line of actions of various forces acting on the body lie in the same plane, these forces are known as coplanar forces. Non-Coplanar Forces If the lines of action of forces forming the system do not lie in the same plane then the system is said to be non-coplanar. Note: Our study is restricted to coplanar forces. Prof. Vinod B Shikhare Page 4

Lecture Notes