Force and Types of forces in Engineering Mechanics | KlassPM

Definition of ‘force’ can be given in several ways. Most simply it can be defined as ‘the cause of change in the state of motion of a particle or body’. It is of course, the product (multiplication) of mass of the particle and its acceleration.
Force is the manifestatA Force has following basic characteristics
i) Magnitude
ii) Direction
iii) Point of application
iv) Line of action
Force is represented as a vector .i.e an arrow with its magnitude.
e.g. for the force shown in Fig. 2.1, magnitude of force is 4KN, direction is 40° with the horizontal in fourth quadrant, point of application is C and line of action is AB.
Module 2 Lesson 2 Fig, 2.2 Characteristics of a Force
Characteristics of a force
Smaller magnitudes of forces are measured in newton (N) and larger in kilonewton (KN).ion of action of one particle on the other. It is a vector quantity.
2.3.5 Concurrent Force System
The forces when extended pass through a single point and the point is called point of concurrency. The lines of actions of all forces meet at the point of concurrency. Concurrent forces may or may not be coplanar.
2.3.6 Non-concurrent Force System
When the forces of a system do not meet at a common point of concurrency, this type of force system is called non-concurrent force system. Parallel forces are the example of this type of force system. Non-concurrent forces may be coplanar or non-coplanar.
2.3.7 Coplanar and concurrent force system
A force system in which all the forces lie in a single plane and meet at one point, For example, forces acting at a joint of a roof truss )
P = External force
F1 to F5 = Member forces (internal) RA and RB = Reactions

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