In the equilibrium of bodies, if the supports are removed and replaced by the supportive reactions then the free body diagram can be understood. Consider the figure below:

Here if the supportive surface is substituted with the reaction R_A then that is an example of free body diagram.

• The point of application of the reaction R_A will be the point of contact A, and from the law of equilibrium of two forces.
• We will concentrate upon that the reaction R_A must vertical and equal to the weight W.
• Hence Fig.2.1 (c), in which the ball is completely isolated from its support and in which all forces acting on the ball are shown by vectors, is known a free-body diagram.

Links of Previous Main Topic:-

• Introduction to statics
• Introduction to vector algebra
• Two dimensional force systems
• Introduction concept of equilibrium of rigid body
• Friction introduction
• Introduction about distributed forces
• Area moments of inertia in rectangular and polar coordinates
• Mass moment of inertia introduction
• Work done by force
• Kinematics of particles
• Position vector velocity and acceleration
• Plane kinematics of rigid bodies introduction
• Combined motion of translation and rotation
• Rectilinear motion in kinetics of particles
• Work and energy
• Linear momentum
• Force mass acceleration
• Simple stress introduction
• Normal strain
• Statically indeterminate system
• Introduction to thermodynamics
• Statement of zeroth law of thermodynamics with explanation
• Heat and work introduction
• First law of thermodynamics for a control mass closed system undergoing a cycle
• Open system and control volume
• Conversion of work into heat
• Introduction to carnot cycle
• Clausius inequality entropy and irreversibility introduction
• Ideal gas or perfect gas
• Introduction about air standard cycles
• Properties of pure substances introduction
• Vapour compression refrigeration cycle introduction
• Basic fluid mechanics and properties of fluids introduction
• Fluid statics introduction
• Manometers measurement pressure
• Fluid kinematics
• Bernoullis equation
• Basics and statics of particles introduction

Link of Next Mechanical Engineering Topics:-

Free body diagram in equilibrium of rigid bodies

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