Dynamics Introduction

• Mechanics is a branch of the physical sciences that is concerned with the state of rest or motion of bodies subjected to the action of forces
• Statics is concerned with the equilibrium of a body that is either at rest or moves with constant velocity
• Dynamics which deals with the accelerated motion of a body
• Galileo Galilei contributed pendulums and falling bodies in Dynamics
• Isaac Newton contributed the three fundamental laws of motion
• Kinematics, which treats only the geometric aspect of the motion
• Kinetics, which is the analysis of the forces causing the motion
• Particle denotes an object of point size.
• Body denotes a system of particles which form an object of appreciable size
• The term particle is used to mean an object whose dimensions are negligible compared with the size of its path
• Rectilinear Kinematics refers to straight line motion
• Position coordinate is used to specify the location of the particle at any given instant.
• Position is a vector quantity since it has both magnitude and direction
• Displacement of the particle is defined as the change in its position
• average speed is always a positive scalar and is defined as the total distance travel by a particle divided by the elapsed time
• The magnitude of velocity is known as the speed